<p>Click card to open</p>

<div class="this-calls-for-some">
  <div class="confetti"></div>
  <div class="confetti"></div>
  <div class="confetti"></div>
  <div class="confetti"></div>
  <div class="confetti"></div>
  <div class="confetti"></div>
  <div class="confetti"></div>
  <div class="confetti"></div>
  <div class="confetti"></div>
  <div class="confetti"></div>
</div>

<div class="card__container js-card-opener">
  <div class="card">
    <div class="card__panel card__panel--front">
      <h1>Dude!</h1>
      <h3>You're having a baby.</h3>
      <div class="baby">
        <div class="baby__hair"></div>
        <div class="baby__face">
          <div class="baby__forehead">
            <div class="baby__eye"></div>
            <div class="baby__eye"></div>
          </div>
          <div class="baby__nose"></div>
          <div class="baby__ear baby__ear--left"></div>
          <div class="baby__ear baby__ear--right"></div>
          <div class="baby__pacifier"></div>
        </div>
      </div>

    </div>
    <div class="card__panel card__panel--inside-left">
    </div>
    <div class="card__panel card__panel--inside-right">
      <p>Hope it's a good one!</p>
      <p><small>(J/K she'll be a great one!)</small></p>
      <p>❤️ Tammy</p>
    </div>
  </div>

</div>

@import url("https://fonts.googleapis.com/css2?family=Delius+Swash+Caps&display=swap");

$transition-delay: 1s;
$card-bg: #e66288;
$card-bg-dark: darken($card-bg, 5%);

body {
  font-family: "Delius Swash Caps", cursive;
  font-size: 20px;
  display: grid;
  place-items: center;
  background: #eee;
  text-align: center;
}

h1,
h3 {
  margin: 0;
}

.card__container {
  cursor: pointer;
  perspective: 1400px;
  transition: all 0.2s ease;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  @media (min-width: 768px) {
    .open & {
      transform: translate(0%, -50%);
    }
  }
}

.card {
  max-width: 400px;
  max-height: 600px;
  width: 80vw;
  height: 120vw;
  margin: auto;
  perspective: 1000px;
  transform-style: preserve-3d;
  transition: all 1s ease;

  &__panel {
    border: 1px solid black;
    transition: all 1s ease;
    backface-visibility: visible;
    transform-origin: left;
    transform-style: preserve-3D;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 95%;
    display: grid;
    place-items: center;

    &--front {
      transform: rotate3d(0, 1, 0, 0deg);
      backface-visibility: hidden;
      background: $card-bg;
      background-image: radial-gradient($card-bg-dark 15%, transparent 16%),
        radial-gradient($card-bg-dark 15%, transparent 16%);
      background-size: 60px 60px;
      background-position: 0 0, 30px 30px;
      z-index: 10;
      color: #fff;
      display: grid;
      grid-template-rows: 1fr 1fr 8fr;
      grid-gap: 0.5em;
      padding: 1em 0;

      .open & {
        transform: rotate3d(0, 1, 0, -170deg);
        @media (min-width: 768px) {
          transition-delay: $transition-delay;
        }
      }
    }

    &--inside-left {
      background: #fff;
      transform: rotate3d(0, 1, 0, 0deg);
      z-index: 0;

      .open & {
        transform: rotate3d(0, 1, 0, -170deg);
        @media (min-width: 768px) {
          transition-delay: $transition-delay;
        }
      }
    }
    &--inside-right {
      border-left: none;
      background: #fff;
      transform: rotate3d(0, 1, 0, 0deg);
      z-index: -1;
      align-content: center;
    }
  }
}

.open {
  .confetti {
    width: 15px;
    height: 15px;
    background-color: #f2d74e;
    position: absolute;
    left: 50%;
    animation: confetti 5s ease-in-out -2s infinite;
    transform-origin: left top;
    z-index: 10;
    @media (min-width: 768px) {
      transition-delay: $transition-delay;
    }
  }
  .confetti:nth-child(1) {
    background-color: #f2d74e;
    left: 10%;
    animation-delay: 0;
  }
  .confetti:nth-child(2) {
    background-color: #95c3de;
    left: 20%;
    animation-delay: -5s;
  }
  .confetti:nth-child(3) {
    background-color: #ff9a91;
    left: 30%;
    animation-delay: -3s;
  }
  .confetti:nth-child(4) {
    background-color: #f2d74e;
    left: 40%;
    animation-delay: -2.5s;
  }
  .confetti:nth-child(5) {
    background-color: #95c3de;
    left: 50%;
    animation-delay: -4s;
  }
  .confetti:nth-child(6) {
    background-color: #ff9a91;
    left: 60%;
    animation-delay: -6s;
  }
  .confetti:nth-child(7) {
    background-color: #f2d74e;
    left: 70%;
    animation-delay: -1.5s;
  }
  .confetti:nth-child(8) {
    background-color: #95c3de;
    left: 80%;
    animation-delay: -2s;
  }
  .confetti:nth-child(9) {
    background-color: #ff9a91;
    left: 90%;
    animation-delay: -3.5s;
  }
  .confetti:nth-child(10) {
    background-color: #f2d74e;
    left: 100%;
    animation-delay: -2.5s;
  }
}

@keyframes confetti {
  0% {
    transform: rotateZ(15deg) rotateY(0deg) translate(0, 0);
  }
  25% {
    transform: rotateZ(5deg) rotateY(360deg) translate(-5vw, 20vh);
  }
  50% {
    transform: rotateZ(15deg) rotateY(720deg) translate(5vw, 60vh);
  }
  75% {
    transform: rotateZ(5deg) rotateY(1080deg) translate(-10vw, 80vh);
  }
  100% {
    transform: rotateZ(15deg) rotateY(1440deg) translate(10vw, 110vh);
  }
}

// Baby
$salmon: #e66266;
$dark-salmon: #c70039;

$skin: #fcbc9f;
$darker-skin: darken($skin, 5%);
$dark-brown: #3b1301;

$eye-width: percentage(50 / 500);
$eye-height: percentage(50 / 500);

$nose-width: percentage(60 /500);
$nose-height: percentage(50 / 500);

$ear-width: percentage(35 / 500);
$ear-height: percentage(65 / 500);

$pacifier-color: #7e62e6;

@keyframes blink {
  0%,
  96% {
    transform: scaleY(1);
  }
  100% {
    transform: scaleY(0.1);
  }
}

@keyframes soother {
  50% {
    transform: scale(1.1);
    left: 0.5%;
    top: 0.5%;
  }
}

.baby {
  width: 80%;
  height: 70%;
  position: relative;
  margin: 0 auto;
  opacity: 1;
  transition: opacity 1.2s ease;
  .open & {
    opacity: 0;
    @media (min-width: 768px) {
      transition-delay: $transition-delay;
    }
  }
  &__hair {
    width: percentage(100/500);
    padding-bottom: percentage(100/500);
    border-top: 5px solid $dark-brown;
    border-top-left-radius: 50%;
    border-top-right-radius: 50%;
    position: absolute;
    left: 50%;
    transform: translateX(-50%) rotate(-45deg);
    top: 0;
    &::after {
      content: "";
      width: 100%;
      height: 100%;
      border-top: 5px solid $dark-brown;
      border-top-left-radius: 50%;
      border-top-right-radius: 50%;
      position: absolute;
      left: 50%;
      transform: translateX(-50%) rotate(-45deg);
      top: 0;
    }
  }
  &__face {
    background: $skin;
    border-radius: 50%;
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-rows: 4fr 1fr 2fr;
    grid-gap: 1em;
  }
  &__forehead {
    display: flex;
    justify-content: space-evenly;
    align-items: flex-end;
    width: 100%;
  }
  &__eye {
    width: $eye-width;
    padding-bottom: $eye-height;
    background: $dark-brown;
    border-radius: 50%;
    position: relative;
    animation: blink 3s alternate infinite;
    &:before {
      content: "";
      background: white;
      width: 20%;
      padding-bottom: 20%;
      border-radius: 50%;
      position: absolute;
      right: 20%;
      top: 20%;
    }
  }
  &__nose {
    border-radius: 50%;
    background: $darker-skin;
    width: $nose-width;
    padding-bottom: $nose-height;
    margin: 0 auto;
    border-bottom: 3px solid darken($darker-skin, 5%);
  }
  &__ear {
    padding-bottom: $ear-height;
    width: $ear-width;
    background: $skin;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    &:before {
      content: "";
      width: 65%;
      background: $darker-skin;
      position: absolute;
      top: 10%;
      bottom: 10%;
    }
    &--left {
      border-radius: 50% 0 0 50%;
      left: -($ear-width) + 1%;
      &:before {
        border-radius: 50% 5% 5% 50%;
        left: 15%;
      }
    }
    &--right {
      border-radius: 0 50% 50% 0;
      right: -($ear-width) + 1%;
      &:before {
        border-radius: 5% 50% 50% 5%;
        right: 15%;
      }
    }
  }

  &__pacifier {
    width: 35%;
    height: 70%;
    margin: 0 auto;
    border-radius: 50%;
    background: $pacifier-color;
    border-bottom: 5px solid darken($pacifier-color, 5%);
    display: flex;
    justify-content: center;
    align-items: center;
    animation: soother 2.5s infinite;
    align-self: center;
    &:before {
      content: "";
      width: 40%;
      padding-bottom: 35%;
      background: darken($pacifier-color, 10%);
      border-bottom: 5px solid darken($pacifier-color, 15%);
      display: block;
      border-radius: 50%;
      margin: 1em auto;
    }
  }
}

const openBtn = document.querySelector(".js-card-opener");

openBtn.onclick = function () {
  document.body.classList.toggle("open");
};