web前端基础案例-纯css制作Apple手机开机动画

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👇html代码：

<div class="progress"></div>

👇css代码：

  <style>
body {
  background: #111 url("http://www.clipartbest.com/cliparts/Rcd/g5d/Rcdg5dXXi.png");
  background-size: 25vmin;
  background-repeat: no-repeat;
  background-position: center 40%;
  height: 100vh;
  margin: 0;
}
.progress {
  width: 400px;
  max-width: 85vw;
  height: 4px;
  position: absolute;
  bottom: 20vh;
  left: 50%;
  border-radius: 4px;
  background: rgba(255,255,255,0.5);
  transform: translate(-50%, -50%);
  overflow: hidden;
}
.progress:after {
  content: '';
  display: block;
  width: 100%;
  height: 4px;
  background: #fff;
  animation: load 15s linear;
}
@-moz-keyframes load {
  0% {
    width: 0;
  }
  10% {
    width: 5%;
  }
  20% {
    width: 15%;
  }
  30% {
    width: 25%;
  }
  40% {
    width: 30%;
  }
  50% {
    width: 44%;
  }
  60% {
    width: 50%;
  }
  70% {
    width: 72%;
  }
  80% {
    width: 84%;
  }
  90% {
    width: 92%;
  }
  100% {
    width: 100%;
  }
}
@-webkit-keyframes load {
  0% {
    width: 0;
  }
  10% {
    width: 5%;
  }
  20% {
    width: 15%;
  }
  30% {
    width: 25%;
  }
  40% {
    width: 30%;
  }
  50% {
    width: 44%;
  }
  60% {
    width: 50%;
  }
  70% {
    width: 72%;
  }
  80% {
    width: 84%;
  }
  90% {
    width: 92%;
  }
  100% {
    width: 100%;
  }
}
@-o-keyframes load {
  0% {
    width: 0;
  }
  10% {
    width: 5%;
  }
  20% {
    width: 15%;
  }
  30% {
    width: 25%;
  }
  40% {
    width: 30%;
  }
  50% {
    width: 44%;
  }
  60% {
    width: 50%;
  }
  70% {
    width: 72%;
  }
  80% {
    width: 84%;
  }
  90% {
    width: 92%;
  }
  100% {
    width: 100%;
  }
}
@keyframes load {
  0% {
    width: 0;
  }
  10% {
    width: 5%;
  }
  20% {
    width: 15%;
  }
  30% {
    width: 25%;
  }
  40% {
    width: 30%;
  }
  50% {
    width: 44%;
  }
  60% {
    width: 50%;
  }
  70% {
    width: 72%;
  }
  80% {
    width: 84%;
  }
  90% {
    width: 92%;
  }
  100% {
    width: 100%;
  }
}

  </style>