CSS效果之扁平化的Loading效果

代码来自 https://github.com/Aaronliu2016/css-tricks

<!-- run -->
<style>
@import url("https://fonts.googleapis.com/css?family=Luckiest+Guy");

bg{
  position: absolute;
  width: 95%;
  height: 98%;
  background-color: skyblue;
  background-attachment: fixed;
  background-size: 100% 100%;
  font-family: "Luckiest Guy", cursive;

}

body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  margin: auto;
  border-radius: 100%;
  background: transparent;
  display: block;
  box-shadow: 0 0 150px 100px rgba(255, 255, 255, 0.6),
    200px 0 200px 150px rgba(255, 255, 255, 0.6),
    -250px 0 300px 150px rgba(255, 255, 255, 0.6),
    550px 0 300px 200px rgba(255, 255, 255, 0.6),
    -550px 0 300px 200px rgba(255, 255, 255, 0.6);
}

h1 {
  cursor: default;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 100px;
  margin: auto;
  display: block;
  text-align: center;
}

h1 span {
  position: relative;
  top: 20px;
  display: inline-block;
  font-size: 80px;
  color: #fff;
  text-shadow: 0 1px 0 #ccc, 0 2px 0 #ccc, 0 3px 0 #ccc, 0 4px 0 #ccc, 0 5px 0 #ccc, 0 6px 0 transparent, 0 7px 0 transparent, 0 8px 0 transparent, 0 9px 0 transparent, 0 10px 10px rgba(0, 0, 0, 0.4);
  animation: bounce 0.3s ease infinite alternate;
}
@keyframes bounce {
  100% {
    top: -20px;
    text-shadow: 0 1px 0 #ccc, 0 2px 0 #ccc, 0 3px 0 #ccc, 0 4px 0 #ccc, 0 5px 0 #ccc, 0 6px 0 #ccc, 0 7px 0 #ccc, 0 8px 0 #ccc, 0 9px 0 #ccc, 0 50px 25px rgba(0, 0, 0, 0.2);
  }
}
h1 span:nth-child(2) {
  animation-delay: 0.1s;
}
h1 span:nth-child(3) {
  animation-delay: 0.2s;
}
h1 span:nth-child(4) {
  animation-delay: 0.3s;
}
h1 span:nth-child(5) {
  animation-delay: 0.4s;
}
h1 span:nth-child(6) {
  animation-delay: 0.5s;
}
h1 span:nth-child(7) {
  animation-delay: 0.6s;
}
h1 span:nth-child(8) {
  animation-delay: 0.7s;
}
h1 span:nth-child(9) {
  animation-delay: 0.8s;
}
</style>

<div class="bg">
<h1>
    <span>l</span>
    <span>o</span>
    <span>a</span>
    <span>d</span>
    <span>i</span>
    <span>n</span>
    <span>g</span>
    <span>.</span>
    <span>.</span>
    <span>.</span>
  </h1>
</div>