css3流光边框效果

See the Pen <a href="https://codepen.io/Beiyu/pen/VwPMYGX">css3流光效果</a> by Beiyu (<a href="https://codepen.io/Beiyu">@Beiyu</a>) on <a href="https://codepen.io">CodePen</a>.

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>流光</title>
  </head>
  <body>
    <a href="#" class="box">
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      hello world
    </a>
    <a href="#" class="box">
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      hello world
    </a>
    <a href="#" class="box">
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      hello world
    </a>
    <a href="#" class="box">
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <p>hello world</p>
      <p>hello world</p>
    </a>
    <a href="#" class="box light">
      <p>hello world</p>
    </a>
    <style>
      body {
        background: #000;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
      }
      .box {
        position: relative;
        display: block;
        padding: 20px 30px;
        letter-spacing: 1px;
        text-decoration: none;
        text-transform: uppercase;
        width: 200px;
        text-align: center;
        margin: 100px 0 0;
        transition: 0.5s;
        color: #03f2ff;
        overflow: hidden;
      }

      .box:hover {
        background: #03f2ff;
        color: #000;
        box-shadow: 0 0 5px #03f2ff, 0 0 25px #03f2ff, 0 0 50px #03f2ff, 0 0 200px #03f2ff;
        -webkit-box-reflect: below 1px linear-gradient(transparent, #000);
      }

      .box:nth-child(1):hover {
        width: 300px;
      }
      .box:nth-child(1) {
        filter: hue-rotate(270deg);
      }
      .box:nth-child(2) {
        filter: hue-rotate(110deg);
      }

      .box:nth-child(4) {
        background: rgba(15, 53, 76, 0.8);
        color: white;
        font-size: 12px;
      }

      /* 流光效果 */
      .box span {
        position: absolute;
        display: block;
      }
      /* 从左到右 */
      .box span:nth-child(1) {
        top: 0;
        left: 0;
        width: 100%;
        height: 1px;
        background: linear-gradient(90deg, transparent, #03f2ff);
        animation: animate1 1s linear infinite;
      }
      @keyframes animate1 {
        0% {
          left: -100%;
        }
        50%,
        100% {
          left: 100%;
        }
      }

      /* 从上到下 */
      .box span:nth-child(2) {
        top: -100%;
        right: 0;
        width: 1px;
        height: 100%;
        background: linear-gradient(180deg, transparent, #03f2ff);
        animation: animate2 1s linear infinite;
        animation-delay: 0.25s;
      }
      @keyframes animate2 {
        0% {
          top: -100%;
        }
        50%,
        100% {
          top: 100%;
        }
      }

      /* 从右到左 */
      .box span:nth-child(3) {
        right: -100%;
        bottom: 0;
        width: 100%;
        height: 1px;
        background: linear-gradient(270deg, transparent, #03f2ff);
        animation: animate3 1s linear infinite;
        animation-delay: 0.5s;
      }
      @keyframes animate3 {
        0% {
          right: -100%;
        }
        50%,
        100% {
          right: 100%;
        }
      }

      /* 从下到上 */
      .box span:nth-child(4) {
        bottom: -100%;
        left: 0;
        width: 1px;
        height: 100%;
        background: linear-gradient(360deg, transparent, #03f2ff);
        animation: animate4 1s linear infinite;
        animation-delay: 0.75s;
      }
      @keyframes animate4 {
        0% {
          bottom: -100%;
        }
        50%,
        100% {
          bottom: 100%;
        }
      }

      /* 闪烁 */
      .light {
        width: 100%;
        height: 100%;
        background: linear-gradient(to right, transparent, rgba(48, 251, 253, 0.48), transparent) center bottom no-repeat;
        animation: glint 2s ease-in-out infinite;
        position: relative;
      }
      .light::after {
        content: '';
        position: absolute;
        width: 100%;
        height: 2px;
        bottom: 0;
        left: 0;
        background: linear-gradient(90deg, transparent, transparent, rgba(48, 251, 253), transparent, transparent);
        box-shadow: 0 -1px 10px #03f2ff;
      }
      /* 呼吸灯 */
      @keyframes glint {
        from {
          opacity: 0.1;
        } /* 动画开始时的不透明度 */
        50% {
          opacity: 1;
        } /* 动画50% 时的不透明度 */
        to {
          opacity: 0.1;
        } /* 动画结束时的不透明度 */
      }
    </style>
  </body>
</html>

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<!DOCTYPE html>

<head>

</head>

<body>

hello world

</a>

hello world

</a>

hello world

</a>

hello world

</a>

hello world

</a>

<style>

body {

background: #000;

display: flex;

flex-direction: column;

justify-content: center;

align-items: center;

}

.box {

position: relative;

display: block;

padding: 20px 30px;

letter-spacing: 1px;

text-decoration: none;

text-transform: uppercase;

width: 200px;

text-align: center;

margin: 100px 0 0;

transition: 0.5s;

color: #03f2ff;

overflow: hidden;

}

.box:hover {

background: #03f2ff;

color: #000;

box-shadow: 0 0 5px #03f2ff, 0 0 25px #03f2ff, 0 0 50px #03f2ff, 0 0 200px #03f2ff;

-webkit-box-reflect: below 1px linear-gradient(transparent, #000);

}

.box:nth-child(1):hover {

width: 300px;

}

.box:nth-child(1) {

filter: hue-rotate(270deg);

}

.box:nth-child(2) {

filter: hue-rotate(110deg);

}

.box:nth-child(4) {

background: rgba(15, 53, 76, 0.8);

color: white;

font-size: 12px;

}

/* 流光效果 */

.box span {

position: absolute;

display: block;

}

/* 从左到右 */

.box span:nth-child(1) {

top: 0;

left: 0;

width: 100%;

height: 1px;

background: linear-gradient(90deg, transparent, #03f2ff);

animation: animate1 1s linear infinite;

}

@keyframes animate1 {

0% {

left: -100%;

}

50%,

100% {

left: 100%;

}

/* 从上到下 */

.box span:nth-child(2) {

top: -100%;

right: 0;

width: 1px;

height: 100%;

background: linear-gradient(180deg, transparent, #03f2ff);

animation: animate2 1s linear infinite;

animation-delay: 0.25s;

}

@keyframes animate2 {

0% {

top: -100%;

}

50%,

100% {

top: 100%;

}

/* 从右到左 */

.box span:nth-child(3) {

right: -100%;

bottom: 0;

width: 100%;

height: 1px;

background: linear-gradient(270deg, transparent, #03f2ff);

animation: animate3 1s linear infinite;

animation-delay: 0.5s;

}

@keyframes animate3 {

0% {

right: -100%;

}

50%,

100% {

right: 100%;

}

/* 从下到上 */

.box span:nth-child(4) {

bottom: -100%;

left: 0;

width: 1px;

height: 100%;

background: linear-gradient(360deg, transparent, #03f2ff);

animation: animate4 1s linear infinite;

animation-delay: 0.75s;

}

@keyframes animate4 {

0% {

bottom: -100%;

}

50%,

100% {

bottom: 100%;

}

/* 闪烁 */

.light {

width: 100%;

height: 100%;

background: linear-gradient(to right, transparent, rgba(48, 251, 253, 0.48), transparent) center bottom no-repeat;

animation: glint 2s ease-in-out infinite;

position: relative;

}

.light::after {

content: '';

position: absolute;

width: 100%;

height: 2px;

bottom: 0;

left: 0;

background: linear-gradient(90deg, transparent, transparent, rgba(48, 251, 253), transparent, transparent);

box-shadow: 0 -1px 10px #03f2ff;

}

/* 呼吸灯 */

@keyframes glint {

from {

opacity: 0.1;

} /* 动画开始时的不透明度 */

50% {

opacity: 1;

} /* 动画50% 时的不透明度 */

to {

opacity: 0.1;

} /* 动画结束时的不透明度 */

}

</style>

</body>

</html>