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HTML 

              
                input(type='checkbox' id="kirbymove")
label(for="kirbymove") ここを押してね！
.kirby_content
  .kirby_inner
    .eye
      .dark
    .eye.two
      .dark
    .mouth
    .cheek
    .cheek.two
    .hand
    .hand.two
  .foot
  .foot.two
  .comment HI!
!

CSS 

              
                $red: #af2d13;
$dark_red_two: #752b42;
$white: #ffffff;
$black: #000000;
$pink: #ff9db5;
$dark_pink: #d77584;
$dark_pink_two: #f0608b;
$blue: #4b4796;
$dark_blue: #2b3e5a;

@mixin pseudos () {
  content: "";
}
@mixin d-none () {
  display: none;
}
div, input, label {
  font-family: "Open Sans", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
}
input[type="checkbox"] {
  @include d-none;
}
input[type="checkbox"] + label {
  text-align: center;
  display: inline-block;
  border-radius: 1vw;
  background-color: $red;
  box-sizing: border-box;
  box-shadow: .5vw .5vw 0 0 $dark_red_two;
  padding: 1.5vw 3.0vw;
  line-height: 1em;
  color: $white;
  font-size: 2vw;
  font-weight: normal;
  cursor: pointer;
}
.kirby_content {
  position: absolute;
  transform: translateX(-50%) translateY(-50%);
  top: 50%;
  left: 50%;
  width: 50%;
  height: auto;
  animation: kirbymove 2s ease-in-out infinite alternate;
  animation-duration: 1.1s;
  .kirby_inner {
    background: linear-gradient(135deg, $pink 70%, $dark_pink);
    border-radius: 50%;
    width: 100%;
    padding: 100% 0 0;
    box-shadow: 0 0 0 0.2vw black;
    .eye, .mouth, .cheek, .hand, foot {
      position: absolute;
    }
    .eye {
        width: 10%;
        padding: 30% 0 0;
        background: $black;
        border-radius: 44%;
        top: 15%;
        left: 30%;
      &:after, &:before {
        @include pseudos;
      }
      &:before {
        background-color: $white;
        position: absolute;
        width: 60%;
        height: 45%;
        border-radius: 44%;
        top: 3%;
        left: 50%;
        transform: translateX(-50%);
        z-index: 2;
      }
      &.two {
        left: 60%;
      }
      .dark {
        position: absolute;
        width: 59%;
        height: 100%;
        top: 0;
        left: 50%;
        transform: translateX(-50%);
        &:before, &:after {
          @include pseudos;
        }
        &:before {
          background-color: black;
          position: absolute;
          width: 100%;
          height: 38%;
          border-radius: 44%;
          top: 47%;
          left: 50%;
          transform: translateX(-50%);
          z-index: 1;
        }
        &:after {
          background-color: $blue;
          position: absolute;
          width: 100%;
          height: 50%;
          border-radius: 44%;
          bottom: 3%;
          left: 50%;
          transform: translateX(-50%);
        }
      }
    }
    .mouth {
      width: 15%;
      height: 8%;
      box-shadow: 0 0.3vw 0 0 $black;
      border-radius: 50%;
      position: absolute;
      top: 50%;
      left: 50%;
      z-index: 50;
      transform: translateX(-50%);
      &:before {
        @include pseudos;
      }
    }
    .cheek {
      background-color: $dark_pink_two;
      position: absolute;
      top: 50%;
      left:10%;
      filter: blur(0.1vw);
      width: 20%;
      height: 10%;
      border-radius: 50%;
      transform: rotate(-10deg);
      z-index: 3;
      &.two {
        left: auto;
        right: 13%;
        transform: rotate(10deg);
      }
    }
    .hand {
      position: absolute;
      top: 40%;
      left: -15%;
      background: linear-gradient(-155deg,$pink 70%,$dark_pink);
      border-radius: 60% 40% 40% 60% / 60% 40% 60% 40%;
      width: 30%;
      padding: 30% 0 0;
      box-shadow: 0 0 0 .2vw $black;
      &:after {
        @include pseudos;
        background: $pink;
        width: 50%;
        height: 100%;
        position: absolute;
        top: 0;
        right: -20%;
        transform: rotate(-3deg);
      }
      &.two {
        top: 20%;
        left: auto;
        right: -14%;
        background: linear-gradient(-35deg,$pink 60%,$dark_pink);
        transform: rotate(165deg);
        box-shadow: 0 0 0 .2vw $black;
        &:after {
          @include pseudos;
          right: -20%;
          transform: rotate(11deg);
        }
      }
    }
  }
  .foot {
    width: 50%;
    height: 30%;
    position: absolute;
    background: $red;
    bottom: -2%;
    border-radius: 50% 40%;
    left: -5%;
    z-index: -1;
    box-shadow: inset 2vw -1vw 0 0 $dark_red_two, 0 0 0 0.2vw $black;
    transform: rotate(-45deg);
    &.two {
     left: auto;
     right: -5%;
     z-index: 1;
    }
  } 
}
.comment {
  font-size: 2.0vw;
  position: absolute;
  top: -10%;
  right: -25%;
  width: 20%;
  height: 0%;
  padding: 12% 10%;
  background: $blue;
  border-radius: 50%;
  text-align: center;
  line-height: 0;
  color: $white;
  font-weight: bold;
  opacity: 0;
  transition: opacity .2s ease;
  box-shadow: 0.5vw 0.5vw 0 0 $dark_blue;
  &:before {
    @include pseudos;
    position: absolute;
    left: 5%;
    bottom: 11%;
    width: 0;
    height: 0;
    margin-bottom: 0;
    border-left: 2vw solid $blue;
    border-top: 3vw solid transparent;
    transform: rotate(-14deg);
    box-shadow: 0 0.5vw 0 0 $dark_blue;
  }
}
input[type="checkbox"]:checked ~ .kirby_content {
  .eye {
    left: 27.5%;
    background: transparent;
    box-shadow: 0 -0.3vw 0 0;
    top: 29%;
    padding: 8% 0 0;
    width: 15%;
    &.two {
      left: 57.5%;
    }
    &:before {
      content: none;
    }
    .dark {
      @include d-none;
    }
  }
  .mouth {
    height: 12%;
    width: 15%;
    border-radius: 40% 40% 50% 50% / 30% 30% 70% 70%;
    background: $dark_red_two;
    &:before {
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 50%;
      height: 50%;
      border-radius: 40% 40% 50% 50% / 30% 30% 70% 70%;
      background: $dark_pink_two;
      display: block;
      position: absolute;
    }
  }
  .comment {
    opacity: 1;
    transition: opacity .2s ease;
  }
}
@keyframes kirbymove{
  0%{
    transform: translateX(-50%) translateY(-50%);
  }
  50%{
    transform: translateX(-50%) translateY(-48%);
  }
  100%{
    transform: translateX(-50%) translateY(-50%);
  }
}
!

JS
!
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