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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