@font-face {
  font-family: barlow-bold;
  src: url(/Barlow-Bold.2ae782b3.ttf);
}
@font-face {
  font-family: malayalam;
  src: url(/Malayalam.c47a24d6.ttf);
}
h1, h2, h3, h4, h5, h6 {
  font-family: barlow-bold;
  text-transform: uppercase;
}

.count span {
  font-family: malayalam;
}

h1 {
  font-size: 4em;
  margin: 0;
}

h2 {
  font-size: 2.5em;
  margin: 0;
}

p {
  font-family: open-sans, arial, sans-serif;
  font-size: 1em;
  line-height: 1.5em;
  margin: 0;
}

@font-face {
  font-family: barlow-bold;
  src: url(/Barlow-Bold.2ae782b3.ttf);
}
.opening-animation .page {
  position: absolute;
  z-index: 11;
  left: 0;
  top: 0;
  height: 100vh;
  width: 100vw;
  background: #0c0c0c;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}
.opening-animation .powered-container {
  width: 100%;
  margin-bottom: 5vh;
  position: relative;
  display: flex;
  justify-content: space-between;
}
.opening-animation .powered-container .reveal-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 40px;
  z-index: 5;
  position: relative;
  overflow: hidden;
}
.opening-animation .powered-container .reveal-container:first-of-type {
  width: 450px;
}
.opening-animation .powered-container .reveal-container:last-of-type {
  width: 195px;
}
.opening-animation .powered-container .reveal-container .reveal-first, .opening-animation .powered-container .reveal-container .reveal-second {
  width: 0;
  height: 40px;
  position: absolute;
  top: 0;
  left: 0;
  background-color: #E7174C;
}
.opening-animation .powered-container .reveal-container .credits {
  display: inline;
  position: relative;
  font-family: barlow-bold;
  color: #fff;
  text-decoration: none;
  font-size: 1em;
  margin-left: 0;
  margin-right: 0;
  padding: 5px 0;
  z-index: 0;
  visibility: hidden;
}
.opening-animation .powered-container .reveal-container .credits.knmi {
  margin-left: 30px;
  margin-right: 5px;
}
.opening-animation .powered-container .reveal-container .credits.knmi::after {
  content: "";
  position: absolute;
  left: -30px;
  top: 0;
  background: url("/powered.15b3fcb3.gif") no-repeat;
  z-index: 1;
  width: 30px;
  height: 30px;
  background-size: 20px;
}
.opening-animation .flex {
  display: flex;
  justify-content: center;
  align-items: center;
}
.opening-animation .flex .container {
  padding: 0 10vw;
  width: calc(100% - 20vw);
  max-width: 1280px;
  margin: 5vh auto 0 auto;
}
.opening-animation .flex .container h1 {
  position: relative;
  overflow: hidden;
  height: 120px;
  width: 100vw;
  margin: 0;
  font-size: 90px;
  color: #E7174C;
  font-family: barlow-bold;
  text-transform: uppercase;
}
.opening-animation .flex .container h1 .hide {
  position: absolute;
  z-index: 99;
  top: 120px;
  left: 0;
}
.opening-animation .second-color-slide-up {
  position: absolute;
  content: "";
  left: 0;
  top: 0;
  width: 100vw;
  height: 100vh;
  background-color: #ED6A63;
  z-index: 11;
}

html {
  scroll-behavior: smooth;
}

body {
  position: relative;
  margin: 0;
  box-sizing: border-box;
  background-color: #80A2D0;
  overflow-x: hidden;
}

.practice {
  height: 200vh;
}

.chapter-trigger {
  height: 5vh;
}

.section {
  padding: 5vh 5vw;
  width: calc(100% - 10vw);
  overflow: hidden;
}
.section .header {
  z-index: 10;
  position: relative;
}
.section p {
  margin-top: 10px;
  color: #000;
}
.section .letter {
  position: relative;
  display: inline-block;
  color: #E73A4D;
}
.section .body-text {
  display: block;
}
.section .container {
  max-width: 1280px;
  margin: 0 auto;
}
.section .container .flex {
  padding: 10vh 0;
  display: flex;
  flex-wrap: nowrap;
  justify-content: space-between;
  align-items: flex-start;
}
.section .container .flex .text-block {
  width: 50%;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  z-index: 10;
}
.section .container .flex .animation {
  width: 50%;
  height: 400px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  z-index: 0;
}
.section .container .flex .animation .text-block {
  width: 100%;
  opacity: 0;
}
.section .container .flex .animation .text-block .chance {
  display: flex;
  align-items: center;
}
.section .container .flex .animation .text-block .chance h2 {
  margin-left: 10px;
  padding: 23px 10px;
  border: solid 6px #000;
  border-radius: 50%;
  color: #000;
}
.section .container .flex .animation .text-block .chance p {
  font-weight: 900;
  font-size: 1.5em;
  transform: translateY(-5px);
  color: #E73A4D;
}
.section .container .flex .animation .text-block .explain-text {
  max-width: 400px;
  margin-right: 0;
}

.chapter-container {
  position: relative;
  min-height: 130vh;
  width: 100vw;
  overflow: hidden;
}
.chapter-container .chapter {
  position: relative;
  overflow: hidden;
  height: 80px;
  margin-bottom: 5vh;
  width: 100%;
  font-family: barlow-bold;
  z-index: 10;
}
.chapter-container .chapter .chapter-appear {
  position: absolute;
  width: calc(100% - 10vw);
  margin-bottom: 5vh;
  z-index: 99;
  top: 100px;
  left: 0;
}
.chapter-container .fixed-wrapper {
  width: 400px;
  position: absolute;
}
.chapter-container .fixed-wrapper #count {
  position: fixed;
  top: 0;
  right: 50px;
  z-index: 9;
}
.chapter-container .fixed-wrapper #count span {
  opacity: 0.1;
  position: relative;
  user-select: none;
}
.chapter-container .fixed-wrapper #count span:first-of-type {
  left: 0;
  font-size: 14em;
}
.chapter-container .fixed-wrapper #count span:nth-of-type(2) {
  top: 50px;
  margin: 0;
  font-size: 8em;
  position: relative;
}
.chapter-container .fixed-wrapper #count span:last-of-type {
  top: 53px;
  right: 10px;
  font-size: 5em;
  position: relative;
}

.name-holder, .no2-holder, .avg-holder, .route-1-holder, .route-2-holder, .route-3-holder {
  font-weight: bold;
}

.chapter-container.intro {
  position: relative;
  min-height: 90vh;
  width: 100vw;
}
.chapter-container.intro .section {
  padding-bottom: 10vh;
}
.chapter-container.intro .chapter {
  color: #223984;
}
.chapter-container.intro .text-flex {
  display: flex;
  justify-content: space-between;
}
.chapter-container.intro .text-flex p {
  display: inline-block;
  position: relative;
  color: #223984;
  width: calc(50% - 50px);
  padding-right: 50px;
  height: 270px;
  overflow: hidden;
}
.chapter-container.intro .text-flex p span {
  position: absolute;
  left: 0;
  top: 100%;
  width: calc(100% - 50px);
}
.chapter-container.intro .top-section {
  box-sizing: border-box;
}
.chapter-container.intro .icon-container {
  display: flex;
  position: relative;
  flex-wrap: wrap;
  box-sizing: border-box;
  justify-content: space-around;
  padding: 0 1em;
}
.chapter-container.intro .icon-card {
  padding: 0 2em 2em 2em;
  margin: 1em 1em 0 1em;
  width: calc(25% - 6em - 8px);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  text-align: center;
  font-family: open sans;
  color: white;
  font-size: 0.8em;
  border: solid 4px #FFF;
  border-radius: 10px;
}
.chapter-container.intro .icon-card img {
  height: 150px;
  margin-top: -10px;
}
.chapter-container.intro .icon-card:last-of-type img {
  margin-top: 5px;
  margin-bottom: -15px;
}
.chapter-container.intro #canvas {
  position: absolute;
  height: 100%;
  width: 100%;
  left: 0;
  top: 0;
}

.chapter-container.amsterdam {
  position: relative;
  min-height: 120vh;
  width: 100vw;
  display: flex;
  align-items: center;
}
.chapter-container.amsterdam .section {
  padding: 15vh 5vw;
  height: auto;
}
.chapter-container.amsterdam .flex {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding-top: 20vh;
  z-index: 10;
}
.chapter-container.amsterdam .flex .map {
  width: 50%;
}
.chapter-container.amsterdam .flex .map .chapter {
  width: 100%;
  margin-bottom: 0;
  transform: translateY(30px);
  letter-spacing: 2px;
  color: #000;
}
.chapter-container.amsterdam .flex .map .chapter span {
  width: 100%;
}
.chapter-container.amsterdam .flex .map img {
  width: 100%;
}
.chapter-container.amsterdam .flex .form {
  width: 40%;
}

.form-container {
  max-width: 400px;
  width: 100%;
  margin: 0 auto;
  position: relative;
}
.form-container #contact {
  position: relative;
  padding: 0 25px 25px 25px;
  background: #f3f2f0;
}
.form-container #contact::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-top: 40px solid #ED6A63;
  border-left: 40px solid #f3f2f0;
  width: 0;
}
.form-container #contact label {
  font-family: barlow-bold, arial, sans-serif;
  color: #000;
  font-size: 1em;
}
.form-container #contact input[type=text], .form-container #contact input[type=email], .form-container #contact input[type=tel], .form-container #contact input[type=url], .form-container #contact textarea, .form-container #contact button[type=submit] {
  font-family: arial, sans-serif;
  font-size: 1em;
  color: #000;
}
.form-container #contact h2 {
  transform: translateY(-32px);
  color: #000;
}
.form-container #contact h4 {
  margin: 5px 0 15px;
  display: block;
  font-size: 13px;
}
.form-container #contact fieldset {
  border: medium none !important;
  margin: 0 0 10px;
  min-width: 100%;
  padding: 0;
  width: 100%;
}
.form-container #contact input[type=text], .form-container #contact input[type=email], .form-container #contact input[type=tel], .form-container #contact input[type=url], .form-container #contact textarea {
  width: calc(100% - 25px);
  border: 2px solid #FFF;
  background: #FFF;
  margin: 0 0 5px;
  padding: 10px;
  transition: all 0.2s;
}
.form-container #contact textarea {
  height: 100px;
  max-width: 100%;
  resize: none;
}
.form-container #contact input:focus, .form-container #contact textarea:focus {
  outline: 0;
  border: 2px solid #000;
}
.form-container #contact .move {
  margin-bottom: 20px;
}
.form-container #contact .move ul {
  width: 100%;
  margin: 0;
  padding: 0;
}
.form-container #contact .move ul li {
  display: inline;
  margin: 0 10px;
}
.form-container #contact .move ul li img {
  width: 35px;
  transform: translateY(6px);
}
.form-container #contact .move ul li:nth-of-type(2) img {
  height: 25px;
  transform: translate(-5px, 1px);
}
.form-container #contact .move ul li:nth-of-type(3) img, .form-container #contact .move ul li:last-of-type img {
  transform: translateY(10px);
}
.form-container #contact .move ul li [type=radio]:checked, .form-container #contact .move ul li [type=radio]:not(:checked) {
  width: 18px;
  height: 18px;
  border: 1px solid #000;
  border-radius: 100%;
  background-color: #FFF;
}
.form-container #contact a {
  display: block;
  margin: 0 0 5px;
  padding: 10px 0;
  width: 100%;
  font-family: barlow-bold, arial, sans-serif;
  cursor: pointer;
  border: none;
  background: #ED6A63;
  color: #FFF;
  font-size: 1em;
  text-decoration: none;
  text-align: center;
}
.form-container #contact a:hover {
  background: #000;
  -webkit-transition: background 0.3s ease-in-out;
  -moz-transition: background 0.3s ease-in-out;
  transition: background-color 0.3s ease-in-out;
}
.form-container #contact a:active {
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
}

.air-pollution {
  display: flex;
  align-items: center;
}
.air-pollution h1, .air-pollution h2, .air-pollution h3 {
  color: #3F4A9A;
}
.air-pollution h2 {
  font-size: 1.5em;
  text-transform: lowercase;
  margin-bottom: 5vh;
}
.air-pollution .chapter {
  color: #3F4A9A;
  margin-bottom: 0;
}
.air-pollution .locations {
  margin-bottom: 2vh;
  color: #3F4A9A;
}
.air-pollution .x.axis, .air-pollution .y.axis {
  color: #3F4A9A;
  font-family: barlow-bold;
  font-size: 0.6em;
}
.air-pollution svg rect.point:first-of-type {
  fill: #FFF;
}
.air-pollution svg rect.point:last-of-type {
  fill: #F39022;
}
.air-pollution .graph-text {
  fill: #3F4A9A;
  font-family: barlow-bold;
  font-size: 1em;
  font-weight: bold;
}

.chapter-container.decease .chapter {
  color: #E73A4D;
}

.astma h2 {
  color: #E73A4D;
}
.astma .explain-text {
  max-width: 400px;
  margin-right: 0;
}
.astma .inhaler-container {
  position: absolute;
  top: 0;
  z-index: 10;
}
.astma .inhaler-container .inhaler-top {
  position: absolute;
  content: "";
  left: 0;
  top: 4px;
  width: 100px;
}
.astma .inhaler-container .inhaler {
  position: absolute;
  content: "";
  left: 11px;
  top: 40px;
  width: 165px;
}
.astma .spray {
  width: 800px;
  position: absolute;
  content: "";
  transform: rotate(-20deg);
  left: -290px;
  bottom: -185px;
  opacity: 0;
}
.astma .spray-container {
  position: absolute;
  content: "";
  transform: rotate(-20deg);
  right: 120px;
  bottom: -170px;
  width: 930px;
  height: 1360px;
  overflow: hidden;
  border-radius: 0px 200px 200px 0px;
  -moz-border-radius: 0px 200px 200px 0px;
  -webkit-border-radius: 0px 200px 200px 0px;
  border: 0px solid #000000;
  opacity: 0;
}
.astma .spray-reveal {
  position: absolute;
  content: "";
  width: 100%;
  height: 100%;
  background: #EEE8D7;
}

.heart .heart-container {
  display: block;
  position: absolute;
  right: 15vw;
  margin: 0 auto;
  width: 250px;
  height: 380px;
}
.heart .heart-container .heart-full {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 9;
}
.heart .heart-container .heart-in {
  position: absolute;
  top: 2px;
  left: -1px;
  width: 95%;
  z-index: 8;
}
.heart .heart-container .heart-in-2 {
  position: absolute;
  top: 110px;
  left: 15px;
  width: 70px;
}
.heart .heart-container .heart-in-3 {
  position: absolute;
  top: 130px;
  right: 38px;
  width: 70px;
}
.heart .text-block-copd {
  padding-left: 3vw;
}

.lung {
  min-height: 100vh;
}
.lung .container {
  max-width: 200vw;
  width: calc(200vw - 10vw);
}
.lung .container .flex .text-block-container {
  width: 50%;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  z-index: 10;
}
.lung .container .flex .animation {
  width: 50%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  z-index: 0;
}
.lung .container .flex .animation .text-block-lung {
  padding-left: 5vw;
  width: 50%;
}
.lung .container .flex .animation .text-block-lung .chance p {
  color: #000;
}
.lung .container .flex .animation .lungs-container {
  width: 500px;
  height: 600px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.lung .container .flex .animation .lung {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 9;
  opacity: 1;
}
.lung .container .flex .animation .lung-flat {
  position: absolute;
  left: 0;
  top: 0;
  z-index: -1;
}
.lung .container .flex .animation .no2 {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
}
.lung .container .flex .animation .no2 .n {
  position: absolute;
  top: 0px;
  left: 165px;
}
.lung .container .flex .animation .no2 .n p {
  font-size: 2em;
  font-weight: bold;
}
.lung .container .flex .animation .no2 .streep1 {
  position: absolute;
  top: 65px;
  left: 150px;
  transform: rotate(40deg);
  border-left: 3px solid black;
  height: 60px;
}
.lung .container .flex .animation .no2 .streep2 {
  position: absolute;
  top: 65px;
  left: 195px;
  transform: rotate(-40deg);
  border-left: 3px solid black;
  height: 60px;
}
.lung .container .flex .animation .no2 .streep2:before {
  content: " ";
  position: absolute;
  z-index: -1;
  top: 2px;
  left: 3px;
  right: 5px;
  bottom: -2px;
  border: 1.5px solid black;
}
.lung .container .flex .animation .no2 .o1, .lung .container .flex .animation .no2 .o2 {
  position: absolute;
  top: 130px;
  width: 20px;
  height: 20px;
  border-style: solid;
  border-color: black;
  border-width: 4px;
  border-radius: 50%;
}
.lung .container .flex .animation .no2 .o1 {
  left: 100px;
}
.lung .container .flex .animation .no2 .o2 {
  left: 225px;
}
.lung .container .flex .animation .no2 .o {
  position: absolute;
}
.lung .container .flex .animation #bubble {
  position: absolute;
  top: 100px;
  right: 100px;
  width: 300px;
  height: 300px;
  margin: 0 auto;
  background: linear-gradient(to left, #EEE8D7, #FFFFFF);
  border-radius: 52% 48% 70% 30%/41% 47% 53% 59%;
  border: solid 5px black;
  animation: bubble ease-in-out infinite;
  opacity: 0;
  transition: all 0.5s ease-in-out;
}
.lung .container .flex .animation #bubble.not-infected {
  background: linear-gradient(to left, #EEE8D7, #FFFFFF);
  animation-duration: 12s;
}
.lung .container .flex .animation #bubble.infected {
  background: linear-gradient(to left, #870000, #190A05);
  animation-duration: 6s;
}
@keyframes bubble {
  25% {
    border-radius: 45% 55% 58% 42%/30% 49% 51% 70%;
  }
  50% {
    transform: translateY(-46px);
    border-radius: 36% 64% 29% 71%/63% 71% 29% 37%;
  }
  75% {
    border-radius: 29% 71% 44% 56%/32% 49% 51% 68%;
  }
}

.copd {
  min-height: 100vh;
}
.copd .animation {
  position: relative;
}
.copd .animation .running-man-container {
  position: absolute;
  overflow: hidden;
  left: -30vw;
  bottom: 0;
  opacity: 0;
  min-height: 250px;
  height: 250px;
  min-width: 180px;
  width: 180px;
  visibility: visible;
}
.copd .animation .running-man-container #running-man {
  margin: 0 auto;
  display: block;
  height: 220px;
  width: 350px;
  position: absolute;
  top: 30px;
  background: url(/running_man.654e32c7.png) 0 0 no-repeat;
  background-size: 3200%;
}
.copd .animation .running-man-container #running-man.play {
  animation: gif steps(63) 7s 1 both;
}

.testing {
  height: 100vh;
}

@keyframes gif {
  0% {
    background-position: 0%;
  }
  100% {
    background-position: 100%;
  }
}
.score .flex {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin: 15vh 0;
}
.score h2, .score p {
  text-align: center;
}
.score .score {
  margin: 5vh 0 0;
  padding: 30px 20px;
  border: solid 8px #000;
  border-radius: 50%;
  font-size: 4em;
  line-height: 1em;
  font-family: barlow-bold, arial, sans-serif;
}
.score .score.second {
  border: solid 8px #FFF;
  color: #FFF;
}
.score .disclaimer {
  max-width: 250px;
}
.score .disclaimer p:first-of-type {
  font-size: 0.7em;
}
.score h2:nth-of-type(2) {
  margin-bottom: 3vh;
}
.score #map {
  position: relative;
  width: 50vw;
  height: 60vh;
  margin-bottom: 15vh;
}
.score .alternate {
  color: #FFF;
}
.score .advice {
  margin: 15vh 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.score .advice ul {
  display: inline-block;
  list-style-type: none;
}
.score .advice ul li {
  position: relative;
  margin: 10px 0 10px 30px;
}
.score .advice ul li::after {
  content: "";
  position: absolute;
  left: -30px;
  top: -5px;
  background: url("/check.14ff3e2a.svg") 0 0 no-repeat;
  width: 25px;
  height: 25px;
  background-size: 25px;
  z-index: 1;
}
.score .advice p {
  max-width: 600px;
}

.checkback {
  height: 100%;
  min-width: 100vh;
  margin: 0 auto;
  box-sizing: border-box;
  /* container for panels */
  /* entire container, keeps perspective */
  /* flip the pane when hovered */
  /* flip speed goes here */
  /* hide back of pane during swap */
  /* front pane, placed above back */
  /* back, initially hidden pane */
  /*  UPDATED! front pane, placed above back */
  /* back, initially hidden pane */
}
.checkback .chapter {
  color: #223984;
  margin-bottom: 0;
}
.checkback .button {
  margin: 0 auto;
  background-color: #80A2D0;
  display: inline-block;
  cursor: pointer;
  color: #FFF;
  font-family: barlow-bold, open-sans, arial;
  font-size: 1em;
  text-align: center;
  padding: 10px 14px;
  text-decoration: none;
  position: relative;
  width: 60%;
  transition: all 0.3s;
}
.checkback .button:hover {
  background-color: #223984;
}
.checkback .container-panel {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  z-index: 10;
}
.checkback .panel-container {
  /* text-align: center; */
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.checkback .panel-item {
  display: inline-block;
  position: relative;
  flex: 0 0 100%;
  color: #DADEDC;
  margin: 0 4em 4em;
  max-width: 300px;
}
.checkback .panel-item.last {
  margin-top: 4em;
}
.checkback .front img {
  margin: 0 auto;
  height: 60%;
  padding-top: 3em;
  display: block;
}
.checkback .front h2 {
  font-family: sans-serif;
  font-size: 1.5em;
  color: #000;
  text-align: center;
}
.checkback .back h2 {
  font-family: sans-serif;
  font-size: 1.5em;
  color: #000;
  text-align: center;
}
.checkback .back li {
  font-family: open-sans, arial, sans-serif;
  font-size: 1em;
  line-height: 1.5em;
  color: #000;
}
.checkback .back ul {
  margin: 1em;
  padding: 0;
  text-align: center;
  list-style: none;
}
.checkback .flip-container {
  perspective: 1000px;
  cursor: pointer;
}
.checkback .flip-container:hover .flipper, .checkback .flip-container.hover:active .flipper {
  transform: rotateY(180deg);
}
.checkback .flip-container, .checkback .front, .checkback .back {
  width: 300px;
  height: 300px;
  border-radius: 10px;
  cursor: pointer;
  position: relative;
}
.checkback .flipper {
  transition: 0.6s;
  transform-style: preserve-3d;
  position: relative;
}
.checkback .front, .checkback .back {
  backface-visibility: hidden;
  position: absolute;
  top: 0;
  left: 0;
}
.checkback .front {
  z-index: 2;
  /* for firefox 31 */
  transform: rotateY(0deg);
  background-color: #EFE8D8;
}
.checkback .back {
  display: flex;
  flex-direction: column;
  justify-content: center;
  transform: rotateY(180deg);
  background-color: #EFE8D8;
}
.checkback .vertical.flip-container {
  position: relative;
}
.checkback .vertical .back {
  transform: rotateX(180deg);
}
.checkback .vertical.flip-container .flipper {
  transform-origin: 100% 190px;
  /* half of height */
}
.checkback .vertical.flip-container:hover .flipper {
  transform: rotateX(-180deg);
}
.checkback .front, .checkback .back {
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transition: 0.6s;
  transition: 0.6s;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  position: absolute;
  top: 0;
  left: 0;
}
.checkback .front {
  z-index: 2;
  -webkit-transform: rotateY(0deg);
  transform: rotateY(0deg);
}
.checkback .back {
  -webkit-transform: rotateY(-180deg);
  transform: rotateY(-180deg);
}
.checkback .eyes {
  /* position: absolute; */
  top: 50%;
  width: 100%;
  text-align: center;
}
.checkback .eye {
  width: 240px;
  height: 120px;
  background: #ffff;
  display: inline-block;
  margin: 40px;
  border-radius: 50%;
  position: relative;
  overflow: hidden;
}
.checkback .ball {
  width: 40px;
  height: 40px;
  background: #000;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 15px solid #57BB90;
}

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