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完整代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>纯css的DNA动画效果</title>
<style>
:root {
--bg-color: radial-gradient(circle at center, #ffffff, #cccccc);
--dot-color1: deepskyblue;
--dot-color2: #000;
}
body {
background: var(--bg-color);
background-size: cover;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}
.dna {
width: 360px;
height: 70px;
perspective: 400px;
transform-style: preserve-3d;
}
.ele {
width: 1px;
height: 70px;
float: left;
margin: 0 8px;
border-left: 1px #B0B0B0 dashed;
position: relative;
transform: rotateX(-360deg);
animation: run 2s linear infinite;
}
.ele:before, .ele:after {
content: '';
width: 10px;
height: 10px;
background: var(--dot-color1);
border-radius: 50%;
position: absolute;
left: 50%;
transform: translateX(-50%);
}
.ele:before {
top: -2px;
background: var(--dot-color2);
}
.ele:after {
bottom: -2px;
}
.ele:nth-of-type(1) {
animation-delay: -0.15s;
}
.ele:nth-of-type(2) {
animation-delay: -0.3s;
}
.ele:nth-of-type(3) {
animation-delay: -0.45s;
}
.ele:nth-of-type(4) {
animation-delay: -0.6s;
}
.ele:nth-of-type(5) {
animation-delay: -0.75s;
}
.ele:nth-of-type(6) {
animation-delay: -0.9s;
}
.ele:nth-of-type(7) {
animation-delay: -1.05s;
}
.ele:nth-of-type(8) {
animation-delay: -1.2s;
}
.ele:nth-of-type(9) {
animation-delay: -1.35s;
}
.ele:nth-of-type(10) {
animation-delay: -1.5s;
}
.ele:nth-of-type(11) {
animation-delay: -1.65s;
}
.ele:nth-of-type(12) {
animation-delay: -1.8s;
}
.ele:nth-of-type(13) {
animation-delay: -1.95s;
}
.ele:nth-of-type(14) {
animation-delay: -2.1s;
}
.ele:nth-of-type(15) {
animation-delay: -2.25s;
}
.ele:nth-of-type(16) {
animation-delay: -2.4s;
}
.ele:nth-of-type(17) {
animation-delay: -2.55s;
}
.ele:nth-of-type(18) {
animation-delay: -2.7s;
}
.ele:nth-of-type(19) {
animation-delay: -2.85s;
}
.ele:nth-of-type(20) {
animation-delay: -3s;
}
@keyframes run {
to {
transform: none;
}
}
</style>
</head>
<body>
<div class="dna">
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
<div class="ele"></div>
</div>
</body>
</html>
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