UIデザイン実装便利帳〜アニメーション編 No1 CSS Animationで作るEmailアイコン

No1 CSS Animationで作るEmailアイコン

HTML

html

<div class=card>
  <div class=heart></div>
</div>

CSS

css

body {
  padding: 0;
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* 封筒 */
.card {
  width: 0;
  height: 0;
  border-top: 100px solid #eee;
  border-right: 170px solid #ddd;
  border-bottom: 100px solid #ccc;
  border-left: 170px solid #ccc;
}

/* ハート */
.heart {
  width: 32px;
  height: 32px;
  background-color: #ff3838;
  transform: translate(-50%, -50%) rotate(45deg);
  animation: heartbeat 1.4s linear infinite;
}

.heart:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #ff3838;
  transform: translateY(-50%);
  border-radius: 50%;
}

.heart:after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #ff3838;
  transform: translateX(-50%);
  border-radius: 50%;
}

/* ハートのアニメーション */
@keyframes heartbeat {
  0% { transform: translate(-50%, -50%) rotate(45deg) scale(1); }
  25% { transform: translate(-50%, -50%) rotate(45deg) scale(1); }
  30% { transform: translate(-50%, -50%) rotate(45deg) scale(1.3); }
  50% { transform: translate(-50%, -50%) rotate(45deg) scale(1.1); }
  70% { transform: translate(-50%, -50%) rotate(45deg) scale(1.3); }
  100% { transform: translate(-50%, -50%) rotate(45deg) scale(1); }
}