[CSS]ぼよよーんと気持ちいいアニメーションでエレメントをページに表示させるスタイルシートのテクニック

Pocket

HTML

HTMLは、画像、ラベル、見出し、テキスト、ラッパーの5つで構成されています。

<div class="cu-card animated bounceIn">
  <div class="cu-card-image animated second bounceIn">
    <img src="http://placehold.it/640x360/99ff99/ffffff" />
    <div class="cu-card-label-group animated third bounceIn">
      ラベル
    </div>
  </div>
  <div class="cu-card-title animated third bounceIn">見出し</div>
  <p class="animated fourth bounceIn">テキスト</p>
</div>

CSS

5つの構成要素それぞれにバウンスインのアニメーションを少しずらしたタイミングで設定します。

body {
 background: #3d3d3d;
 padding: 30px;
}

.cu-card {
  float:left;
  margin: 0 20px 0 0;
  background: white;
  width: 300px;
  height: 300px;
  border: 1px solid #1a1a1a;
}

.cu-card-image {
  position: relative;
  width: 100%;
  height: 56.25%;
  overflow: hidden;
}

.cu-card-image img{
  width: 100%;
  height: auto;
}

.cu-card-title {
  padding: 2% 3%;
  font-size: 1.2em;
}

p {
  margin: 0;
  padding: 0 3%;
  font-size: 1em;
}

.cu-card-label-group {
  position: absolute;
  bottom: 0;
  left: 0;
  background: #333;
  padding: 1% 3%;
  color: white;
}

.animated {
  -webkit-animation-duration: .5s;
  animation-duration: .5s;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
}

.second {
  -webkit-animation-delay: .2s;
  animation-delay: .2s;
}

.third {
  -webkit-animation-delay: .4s;
  animation-delay: .4s;
}

.fourth {
  -webkit-animation-delay: .6s;
  animation-delay: .6s;
}

@-webkit-keyframes bounceIn {
  0%, 20%, 40%, 60%, 80%, 100% {
    -webkit-transition-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    transition-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  0% {
    opacity: 0;
    -webkit-transform: scale3d(.3, .3, .3);
    transform: scale3d(.3, .3, .3);
  }

  20% {
    -webkit-transform: scale3d(1.1, 1.1, 1.1);
    transform: scale3d(1.1, 1.1, 1.1);
  }

  40% {
    -webkit-transform: scale3d(.9, .9, .9);
    transform: scale3d(.9, .9, .9);
  }

  60% {
    opacity: 1;
    -webkit-transform: scale3d(1.03, 1.03, 1.03);
    transform: scale3d(1.03, 1.03, 1.03);
  }

  80% {
    -webkit-transform: scale3d(.97, .97, .97);
    transform: scale3d(.97, .97, .97);
  }

  100% {
    opacity: 1;
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
}

@keyframes bounceIn {
  0%, 20%, 40%, 60%, 80%, 100% {
    -webkit-transition-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
    transition-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  0% {
    opacity: 0;
    -webkit-transform: scale3d(.3, .3, .3);
    -ms-transform: scale3d(.3, .3, .3);
    transform: scale3d(.3, .3, .3);
  }

  20% {
    -webkit-transform: scale3d(1.1, 1.1, 1.1);
    -ms-transform: scale3d(1.1, 1.1, 1.1);
    transform: scale3d(1.1, 1.1, 1.1);
  }

  40% {
    -webkit-transform: scale3d(.9, .9, .9);
    -ms-transform: scale3d(.9, .9, .9);
    transform: scale3d(.9, .9, .9);
  }

  60% {
    opacity: 1;
    -webkit-transform: scale3d(1.03, 1.03, 1.03);
    -ms-transform: scale3d(1.03, 1.03, 1.03);
    transform: scale3d(1.03, 1.03, 1.03);
  }

  80% {
    -webkit-transform: scale3d(.97, .97, .97);
    -ms-transform: scale3d(.97, .97, .97);
    transform: scale3d(.97, .97, .97);
  }

  100% {
    opacity: 1;
    -webkit-transform: scale3d(1, 1, 1);
    -ms-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
}

.bounceIn {
  -webkit-animation-name: bounceIn;
  animation-name: bounceIn;
  -webkit-animation-duration: .75s;
  animation-duration: .75s;
}

@-webkit-keyframes zoomInDown {
  0% {
    opacity: 0;
    -webkit-transform: scale3d(.1, .1, .1) translate3d(0, -1000px, 0);
    transform: scale3d(.1, .1, .1) translate3d(0, -1000px, 0);
    -webkit-animation-timing-function: cubic-bezier(0.550, 0.055, 0.675, 0.190);
    animation-timing-function: cubic-bezier(0.550, 0.055, 0.675, 0.190);
  }

  60% {
    opacity: 1;
    -webkit-transform: scale3d(.475, .475, .475) translate3d(0, 60px, 0);
    transform: scale3d(.475, .475, .475) translate3d(0, 60px, 0);
    -webkit-animation-timing-function: cubic-bezier(0.175, 0.885, 0.320, 1);
    animation-timing-function: cubic-bezier(0.175, 0.885, 0.320, 1);
  }
}

@keyframes zoomInDown {
  0% {
    opacity: 0;
    -webkit-transform: scale3d(.1, .1, .1) translate3d(0, -1000px, 0);
    -ms-transform: scale3d(.1, .1, .1) translate3d(0, -1000px, 0);
    transform: scale3d(.1, .1, .1) translate3d(0, -1000px, 0);
    -webkit-animation-timing-function: cubic-bezier(0.550, 0.055, 0.675, 0.190);
    animation-timing-function: cubic-bezier(0.550, 0.055, 0.675, 0.190);
  }

  60% {
    opacity: 1;
    -webkit-transform: scale3d(.475, .475, .475) translate3d(0, 60px, 0);
    -ms-transform: scale3d(.475, .475, .475) translate3d(0, 60px, 0);
    transform: scale3d(.475, .475, .475) translate3d(0, 60px, 0);
    -webkit-animation-timing-function: cubic-bezier(0.175, 0.885, 0.320, 1);
    animation-timing-function: cubic-bezier(0.175, 0.885, 0.320, 1);
  }
}

.zoomInDown {
  -webkit-animation-name: zoomInDown;
  animation-name: zoomInDown;
}

@-webkit-keyframes fadeInDownBig {
  0% {
    opacity: 0;
    -webkit-transform: translate3d(0, -2000px, 0);
    transform: translate3d(0, -2000px, 0);
  }

  100% {
    opacity: 1;
    -webkit-transform: none;
    transform: none;
  }
}

@keyframes fadeInDownBig {
  0% {
    opacity: 0;
    -webkit-transform: translate3d(0, -2000px, 0);
    -ms-transform: translate3d(0, -2000px, 0);
    transform: translate3d(0, -2000px, 0);
  }

  100% {
    opacity: 1;
    -webkit-transform: none;
    -ms-transform: none;
    transform: none;
  }
}

.fadeInDownBig {
  -webkit-animation-name: fadeInDownBig;
  animation-name: fadeInDownBig;
}