css3怎么实现wifi信号逐渐增强效果

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效果图

下面是实现代码：

    
    
        *{
            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;
            }
        }