6分钟实现CSS炫光倒影按钮

话不多，先看效果：

回归老本行，继续分享简单有趣的CSS创意特效，放松放松心情~

实现过程（完整源码在最后）：

1 老样子，定义基本样式：

   *{
             margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'fangsong';
        }
        body{
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: rgb(0, 0, 0);
        }

font-family: ‘fangsong’; 仿宋字体。 display: flex; align-items: center; justify-content: center; flex布局，让按钮在屏幕居中。

2.定义基本标签：

        <a href="#" class="item item1">
            aurora
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </a>
        <a href="#" class="item item2">
            aurora
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </a>
        <a href="#" class="item item3">
            aurora
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </a>

3个a标签就对应3个按钮，每个按钮里4个span就是环绕按钮的4条边。且都有个公共的选择器 .item 和只属于自己的选择器。

3.定义每个按钮的基本样式：

 .item{
            position: relative;
            margin: 50px;
            width: 300px;
            height: 80px;
            text-align: center;
            line-height: 80px;
            text-transform: uppercase;
            text-decoration: none;
            font-size: 35px;
            letter-spacing: 5px;
            color: aqua;
            overflow: hidden;
            -webkit-box-reflect: below 1px linear-gradient( transparent,rgba(6, 133, 133,0.3));
        }

text-align: center;文字对齐方式。 line-height: 80px; 字行高。 text-transform: uppercase; 字母为大写。 text-decoration: none; 去掉a标签默认下划线。 letter-spacing: 5px; 每个字符间的距离。 overflow: hidden;溢出隐藏。 -webkit-box-reflect: below 1px linear-gradient( transparent,rgba(6, 133, 133,0.3)); 这个属性能实现倒影效果。

4. 鼠标经过按钮样式改变：

 .item:hover{
            background-color: aqua;
            box-shadow:0 0 5px aqua,
            0 0 75px aqua,
            0 0 155px aqua;
            color: black;
        }

box-shadow:0 0 5px aqua, 0 0 75px aqua, 0 0 155px aqua; 阴影，写多行可以叠加更亮。

5.设置环绕按钮的4根线上面那条的样式：

.item span:nth-of-type(1){
            position: absolute;
            left: -100%; 
            width: 100%;
            height: 3px;
            background-image: linear-gradient(to left,aqua ,transparent);
            animation: shang 1s linear infinite;
        }
        @keyframes shang{
            0%{
                left:-100%;
            }
            50%,100%{
                left:100%;
            }
        }

position: absolute; left: -100%; 定位在对应位置。 background-image: linear-gradient(to left,aqua ,transparent); 线性渐变颜色。 animation: shang 1s linear infinite; 动画属性，让它动起来。

5.以此类推，设置环绕按钮的其它3根样式：

  .item span:nth-of-type(2){
            position: absolute;
            top: -100%;
            right: 0;
            width: 3px;
            height: 100%;
            background-image: linear-gradient(to top,aqua ,transparent);
            animation: you 1s linear infinite;
            animation-delay: 0.25s;
        }
        @keyframes you{
            0%{
                top:-100%;
            }
            50%,100%{
                top:100%;
            }
        }
        .item span:nth-of-type(3){
            position: absolute;
            right: -100%;
            bottom: 0;
            width: 100%;
            height: 3px;
            background-image: linear-gradient(to right,aqua ,transparent);
            animation: xia 1s linear infinite;
            animation-delay: 0.5s;
        }
        @keyframes xia{
            0%{
                right:-100%;
            }
            50%,100%{
                right:100%;
            }
        }
        .item span:nth-of-type(4){
            position: absolute;
            bottom: -100%;
            left: 0;
            width: 3px;
            height: 100%;
            background-image: linear-gradient(to bottom,aqua ,transparent);
            animation: zuo 1s linear infinite;
            animation-delay: 0.75s;
        }
        @keyframes zuo{
            0%{
                bottom:-100%;
            }
            50%,100%{
                bottom:100%;
            }
        }

animation-delay: 0.75s; 动画延迟执行。每条线对应延迟一段时间，形成时间差，形成环绕效果。

6.给第一，第三个按钮设置其它颜色：

 .item1{
            filter: hue-rotate(100deg);
        }
        .item3{
            filter: hue-rotate(250deg);
        }

filter: hue-rotate(100deg); 用色相旋转，这样不管背景还是阴影颜色都变了。

完整代码：

<!DOCTYPE html>
<html lang="zh-CN">
<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>Document</title>
    <style> *{ margin: 0; padding: 0; box-sizing: border-box; font-family: 'fangsong'; } body{ height: 100vh; display: flex; align-items: center; justify-content: center; background-color: rgb(0, 0, 0); } .item{ position: relative; margin: 50px; width: 300px; height: 80px; text-align: center; line-height: 80px; text-transform: uppercase; text-decoration: none; font-size: 35px; letter-spacing: 5px; color: aqua; overflow: hidden; -webkit-box-reflect: below 1px linear-gradient( transparent,rgba(6, 133, 133,0.3)); } .item:hover{ background-color: aqua; box-shadow:0 0 5px aqua, 0 0 75px aqua, 0 0 155px aqua; color: black; } .item span:nth-of-type(1){ position: absolute; left: -100%; width: 100%; height: 3px; background-image: linear-gradient(to left,aqua ,transparent); animation: shang 1s linear infinite; } @keyframes shang{ 0%{ left:-100%; } 50%,100%{ left:100%; } } .item span:nth-of-type(2){ position: absolute; top: -100%; right: 0; width: 3px; height: 100%; background-image: linear-gradient(to top,aqua ,transparent); animation: you 1s linear infinite; animation-delay: 0.25s; } @keyframes you{ 0%{ top:-100%; } 50%,100%{ top:100%; } } .item span:nth-of-type(3){ position: absolute; right: -100%; bottom: 0; width: 100%; height: 3px; background-image: linear-gradient(to right,aqua ,transparent); animation: xia 1s linear infinite; animation-delay: 0.5s; } @keyframes xia{ 0%{ right:-100%; } 50%,100%{ right:100%; } } .item span:nth-of-type(4){ position: absolute; bottom: -100%; left: 0; width: 3px; height: 100%; background-image: linear-gradient(to bottom,aqua ,transparent); animation: zuo 1s linear infinite; animation-delay: 0.75s; } @keyframes zuo{ 0%{ bottom:-100%; } 50%,100%{ bottom:100%; } } .item1{ filter: hue-rotate(100deg); } .item3{ filter: hue-rotate(250deg); } </style>
</head>
<body>
     
        <a href="#" class="item item1">
            aurora
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </a>
        <a href="#" class="item item2">
            aurora
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </a>
        <a href="#" class="item item3">
            aurora
            <span></span>
            <span></span>
            <span></span>
            <span></span>
        </a>
 
</body>
</html>