CSS3实现边框线条动画特效

 

<div class="box-line">div>

CSS代码

.box-line, .box-line::before, .box-line::after {
 position: absolute;
 top: 0;
 bottom: 0;
 left: 0;
 right: 0;
}

.box-line {
 width: 200px;
 height: 200px;
 margin: auto;
 background: url("img/Button-White-Large.png") no-repeat 50%/70% rgba(0, 0, 0, 0.1);
 color: #69ca62;
 box-shadow: inset 0 0 0 1px rgba(105, 202, 98, 0.5);
}
.box-line::before, .box-line::after {
 content: '';
 z-index: -1;
 margin: -5%;
 box-shadow: inset 0 0 0 2px;
 animation: clipMe 8s linear infinite;
}
.box-line::before {
 animation-delay: -4s;
}
.box-line:hover::after, .box-line:hover::before {
 background-color: rgba(255, 0, 0, 0.3);
}

@keyframes clipMe {
 0%, 100% {
 clip: rect(0px, 220.0px, 2px, 0px);
 }
 25% {
 clip: rect(0px, 2px, 220.0px, 0px);
 }
 50% {
 clip: rect(218.0px, 220.0px, 220.0px, 0px);
 }
 75% {
 clip: rect(0px, 220.0px, 220.0px, 218.0px);
 }
}

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