效果图：
代码示例
<!DOCTYPE html>
<html lang="zh"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>* {margin: 0;padding: 0;}/* 流光效果 */.light {position: absolute;display: block;}.light:nth-child(1) {filter: hue-rotate(0deg);top: 0;left: 0;width: 100%;height: 3px;background: linear-gradient(90deg, transparent, #3a86ff);animation: animate1 8s linear infinite;}@keyframes animate1 {0% {left: -100%;}50%,100% {left: 100%;}}.light:nth-child(2) {filter: hue-rotate(60deg);top: -100%;right: 0;width: 3px;height: 100%;background: linear-gradient(180deg, transparent, #3a86ff);animation: animate2 8s linear infinite;animation-delay: 2s;}@keyframes animate2 {0% {top: -100%;}50%,100% {top: 100%;}}.light:nth-child(3) {filter: hue-rotate(120deg);bottom: 0;right: 0;width: 100%;background: linear-gradient(270deg, transparent, #3a86ff);animation: animate3 8s linear infinite;animation-delay: 4s;}@keyframes animate3 {0% {right: -100%;height: 3px;}50%,100% {height: 2px;right: 100%;}}.light:nth-child(4) {filter: hue-rotate(300deg);bottom: -100%;left: 0;width: 3px;height: 100%;background: linear-gradient(360deg, transparent, #3a86ff);animation: animate4 8s linear infinite;animation-delay: 6s;}@keyframes animate4 {0% {bottom: -100%;}50%,100% {bottom: 100%;}}.boxs {width: 100%;display: flex;justify-content: center;overflow: hidden;}.box {width: 300px;height: 300px;background-color: antiquewhite;text-align: center;}.box {position: relative;/* 让伪元素相对于.box定位 */overflow: hidden;/* 隐藏超出.box的部分 */}</style></head><body><div class="boxs"><div class="box"><span class="light"></span><span class="light"></span><span class="light"></span><span class="light"></span><p>流光效果</p></div></div></body>
</html>希望可以帮到大家
