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HTML

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Adding Classes

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About the <head>

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CSS

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CSS Base

About CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div id="container">
  <div class="toggle">
    <input type="checkbox" name="toggle" class="check-checkbox" id="mytoggle">
    <label class="check-label" for="mytoggle">
      <div id="background"></div>
      <span class="face">
        <span class="face-container">
          <span class="eye left"></span>
          <span class="eye right"></span>
          <span class="mouth"></span>
        </span>
      </span>
    </label>
  </div>
</div>
!

CSS 

              
                * {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  &::before, &::after {
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
  }
}

body {
  min-height: 100vh;
  background: #fff;
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.5;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 0.625rem;
  grid-template-areas: ". main main ." ". main main .";
}

#container {
  width: 12.25rem;
  height: 5.5rem;
  margin: 0;
  grid-area: main;
  -ms-flex-item-align: center;
  -ms-grid-row-align: center;
  align-self: center;
  -ms-grid-column-align: center;
  justify-self: center;
}

.toggle {
  position: absolute;
  width: 12.25rem;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

[type="checkbox"] {
  display: none;
}

.check-label {
  display: block;
  width: 12.25rem;
  height: 5.5rem;
  border: none;
  border-radius: 3rem;
  background: #d7d7d7;
  cursor: pointer;
  overflow: hidden;
  .face {
    display: block;
    position: absolute;
    content: '';
    top: 0.45rem;
    bottom: 0;
    right: 7.25rem;
    width: 4.5rem;
    height: 4.5rem;
    margin: 0;
    border: none;
    border-radius: 3rem;
    background: -webkit-linear-gradient(45deg, #dedede 0%, #fff 70%);
    background: -o-linear-gradient(45deg, #dedede 0%, #fff 70%);
    background: linear-gradient(45deg, #dedede 0%, #fff 70%);
    -webkit-transition: all 0.45s ease-in-out;
    -o-transition: all 0.45s ease-in-out;
    transition: all 0.45s ease-in-out;
    overflow: hidden;
  }
}

[type="checkbox"] {
  + .check-label #background {
    width: inherit;
    height: inherit;
    border: none;
    border-radius: inherit;
    background: -webkit-gradient(linear, right top, left top, from(#f39ab6), to(#f39af3));
    background: -webkit-linear-gradient(right, #f39ab6, #f39af3);
    background: -o-linear-gradient(right, #f39ab6, #f39af3);
    background: linear-gradient(to left, #f39ab6, #f39af3);
    opacity: 0;
    -webkit-transition: all 0.45s ease-in-out;
    -o-transition: all 0.45s ease-in-out;
    transition: all 0.45s ease-in-out;
  }
  &:checked + .check-label #background {
    opacity: 1;
  }
}

.face-container {
  position: absolute;
  width: 4.5rem;
  height: 4.5rem;
}

.face {
  -webkit-box-shadow: 0 0.3rem 0.3rem 0 rgba(0, 0, 0, 0.25);
  box-shadow: 0 0.3rem 0.3rem 0 rgba(0, 0, 0, 0.25);
}

.eye {
  position: absolute;
  top: 2.25rem;
  height: 0.25rem;
  width: 0.625rem;
  background: #8e8e8e;
  border-radius: 0 0 100% 50%;
  &.left {
    left: 0.75rem;
  }
  &.right {
    left: 2.125rem;
  }
}

.mouth {
  position: absolute;
  top: 3.125rem;
  left: 1.45rem;
  width: 0.475rem;
  height: 0.25rem;
  background: #8e8e8e;
  border-radius: 40% 40% 100% 50%;
}

[type="checkbox"] {
  &:checked {
    + .check-label .face {
      right: 0.6rem;
      .face-container {
        -webkit-animation: rotateElement forwards 0.3s;
        animation: rotateElement forwards 0.3s;
      }
      .eye {
        &.left, &.right {
          -webkit-animation: changeFace forwards 0.3s 0.075s;
          animation: changeFace forwards 0.3s 0.075s;
        }
      }
      .mouth {
        -webkit-animation: changeMouth forwards 0.3s 0.075s;
        animation: changeMouth forwards 0.3s 0.075s;
      }
    }
    + .check-label .face .eye {
      &.left {
        left: 1rem;
      }
      &.right {
        left: 2.5rem;
      }
    }
  }
  + .check-label .face {
    .face-container {
      -webkit-animation: rotateElementReverse forwards 0.3s;
      animation: rotateElementReverse forwards 0.3s;
    }
    .eye {
      &.left, &.right {
        -webkit-animation: changeFaceReverse forwards 0.3s;
        animation: changeFaceReverse forwards 0.3s;
      }
    }
    .mouth {
      -webkit-animation: changeMouthReverse forwards 0.3s;
      animation: changeMouthReverse forwards 0.3s;
    }
  }
}

@-webkit-keyframes rotateElement {
  0% {
    left: 0;
  }

  25% {
    left: 4rem;
  }

  30% {
    opacity: 0;
  }

  50% {
    opacity: 0;
    left: -4rem;
  }

  90% {
    opacity: 1;
  }

  100% {
    left: 1rem;
    opacity: 1;
  }
}


@keyframes rotateElement {
  0% {
    left: 0;
  }

  25% {
    left: 4rem;
  }

  30% {
    opacity: 0;
  }

  50% {
    opacity: 0;
    left: -4rem;
  }

  90% {
    opacity: 1;
  }

  100% {
    left: 1rem;
    opacity: 1;
  }
}


@-webkit-keyframes changeFace {
  100% {
    top: 1.7rem;
    width: 0.375rem;
    height: 0.375rem;
    background: #8e8e8e;
    border: none;
    border-radius: 100%;
  }
}


@keyframes changeFace {
  100% {
    top: 1.7rem;
    width: 0.375rem;
    height: 0.375rem;
    background: #8e8e8e;
    border: none;
    border-radius: 100%;
  }
}


@-webkit-keyframes changeMouth {
  100% {
    top: 2.55rem;
    left: 1.125rem;
    height: 0.625rem;
    width: 1.625rem;
    background: #8e8e8e;
    background-image: -webkit-gradient(linear, left top, left bottom, from(#8e8e8e), to(#a4a4a4));
    background-image: -webkit-linear-gradient(top, #8e8e8e, #a4a4a4);
    background-image: -o-linear-gradient(top, #8e8e8e, #a4a4a4);
    background-image: linear-gradient(to bottom, #8e8e8e, #a4a4a4);
    border-radius: 0.2rem 0.2rem 1rem 1rem;
  }
}


@keyframes changeMouth {
  100% {
    top: 2.55rem;
    left: 1.125rem;
    height: 0.625rem;
    width: 1.625rem;
    background: #8e8e8e;
    background-image: -webkit-gradient(linear, left top, left bottom, from(#8e8e8e), to(#a4a4a4));
    background-image: -webkit-linear-gradient(top, #8e8e8e, #a4a4a4);
    background-image: -o-linear-gradient(top, #8e8e8e, #a4a4a4);
    background-image: linear-gradient(to bottom, #8e8e8e, #a4a4a4);
    border-radius: 0.2rem 0.2rem 1rem 1rem;
  }
}


@-webkit-keyframes rotateElementReverse {
  0% {
    left: 0;
  }

  25% {
    left: -4rem;
  }

  30% {
    opacity: 0;
  }

  50% {
    opacity: 0;
    left: 4rem;
  }

  90% {
    opacity: 1;
  }

  100% {
    left: 0;
    opacity: 1;
  }
}


@keyframes rotateElementReverse {
  0% {
    left: 0;
  }

  25% {
    left: -4rem;
  }

  30% {
    opacity: 0;
  }

  50% {
    opacity: 0;
    left: 4rem;
  }

  90% {
    opacity: 1;
  }

  100% {
    left: 0;
    opacity: 1;
  }
}


@-webkit-keyframes changeFaceReverse {
  0% {
    top: 1.7rem;
    width: 0.375rem;
    height: 0.375rem;
    border: none;
    border-radius: 100%;
    background: #8e8e8e;
  }
}


@keyframes changeFaceReverse {
  0% {
    top: 1.7rem;
    width: 0.375rem;
    height: 0.375rem;
    border: none;
    border-radius: 100%;
    background: #8e8e8e;
  }
}


@-webkit-keyframes changeMouthReverse {
  0% {
    top: 2.55rem;
    left: 0.9rem;
    height: 0.625rem;
    width: 1.625rem;
    background: #8e8e8e;
    background-image: -webkit-gradient(linear, left top, left bottom, from(#8e8e8e), to(#a4a4a4));
    background-image: -webkit-linear-gradient(top, #8e8e8e, #a4a4a4);
    background-image: -o-linear-gradient(top, #8e8e8e, #a4a4a4);
    background-image: linear-gradient(to bottom, #8e8e8e, #a4a4a4);
    border: none;
    border-radius: 0.2rem 0.2rem 1rem 1rem;
  }

  25% {
    left: 1.125rem;
  }
}


@keyframes changeMouthReverse {
  0% {
    top: 2.55rem;
    left: 0.9rem;
    height: 0.625rem;
    width: 1.625rem;
    background: #8e8e8e;
    background-image: -webkit-gradient(linear, left top, left bottom, from(#8e8e8e), to(#a4a4a4));
    background-image: -webkit-linear-gradient(top, #8e8e8e, #a4a4a4);
    background-image: -o-linear-gradient(top, #8e8e8e, #a4a4a4);
    background-image: linear-gradient(to bottom, #8e8e8e, #a4a4a4);
    border: none;
    border-radius: 0.2rem 0.2rem 1rem 1rem;
  }

  25% {
    left: 1.125rem;
  }
}
!

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