css3实现wifi信号逐渐增强效果实例

整理文档，搜刮出一个css3实现wifi信号逐渐增强效果实例的代码，稍微整理精简一下做下分享。

效果图

下面是实现代码：

<!DOCTYPE html><meta charset="utf-8"><html><head>    <title>wifi信号</title>    <style type="text/css">        *{            margin: 0;            padding: 0;        }        .box {            width: 240px;            height: 240px;            box-sizing: border-box;            position: relative;            margin: 100px auto;        }        .wifi-symbol {            width: 200px;            height: 200px;            margin-left: 18px;            box-sizing: border-box;            overflow: hidden;            transform: rotate(45deg);        }        .wifi-circle {            border: 10px solid #ccc;            border-radius: 50%;            position: absolute;        }        .first {            width: 260px;            height: 260px;            top: 0;            left: 0;            animation: run1 4s linear infinite;        }        @keyframes run1 {            0% {                border-color: #ccc;            }            25% {                border-color: #ccc;            }            50% {                border-color: #ccc;            }            75% {                border-color: #ccc;            }            100% {                border-color: #97a8e6;            }        }        .second {            width: 200px;            height: 200px;            top: 60px;            left: 60px;            animation: run2 4s linear infinite;        }        @keyframes run2 {            0% {                border-color: #ccc;            }            25% {                border-color: #ccc;            }            50% {                border-color: #ccc;            }            75% {                border-color: #97a8e6;            }            100% {                border-color: #ccc;            }        }        .third {            width: 140px;            height: 140px;            top: 120px;            left: 120px;            animation: run3 4s linear infinite;        }        @keyframes run3 {            0% {                border-color: #ccc;            }            25% {                border-color: #ccc;            }            50% {                border-color: #97a8e6;            }            75% {                border-color: #ccc;            }            100% {                border-color: #ccc;            }        }        .fourth {            width: 20px;            height: 20px;            background: #ccc;            top: 180px;            left: 180px;            animation: run4 4s linear infinite;        }        @keyframes run4 {            0% {                background: #ccc;                border-color: #ccc;            }            25% {                background: #97a8e6;                border-color: #97a8e6;            }            50% {                background: #ccc;                border-color: #ccc;            }            75% {                background: #ccc;                border-color: #ccc;            }            100% {                background: #ccc;                border-color: #ccc;            }        }    </style></head><body>    <div class="box">        <div class="wifi-symbol">          <div class="wifi-circle first"></div>          <div class="wifi-circle second"></div>          <div class="wifi-circle third"></div>          <div class="wifi-circle fourth">        </div>    </div></body></html>

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css3实现wifi信号逐渐增强效果实例