使用纯 CSS 创作一个渐变色动画边框_CSS教程_CSS_网页制作_

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 html, body, .box { height: 100%; display: flex; align-items: center; justify-content: center; }

 body { background: #222; }

 .box { color: white; font-size: 2.5em; width: 10em; height: 5em; background: #111; font-family: sans-serif; line-height: 1.5em; text-align: center; border-radius: 0.2em; }

 .box { position: relative; } .box::after { content: ''; position: absolute; width: 102%; height: 104%; background-color: orange; z-index: -1; border-radius: 0.2em; }

 .box::after { /*background-color: orange;*/ background-image: linear-gradient(60deg, aquamarine, cornflowerblue, goldenrod, hotpink, salmon, lightgreen, sandybrown, violet); }

 .box::after { background-size: 300%, 300%; animation: animate_bg 5s ease infinite alternate; } @keyframes animate_bg { 0% { background-position: 0%, 50%; } 50% { background-position: 100%, 50%; } 100% { background-position: 0%, 50%; } }

 .box { animation: animate_text 2s linear infinite alternate; } @keyframes animate_text { from { color: lime; } to { color: yellow; } }