炫酷的閃光按鈕

哈哈哈，從b站學習的css效果，在這裏從新敲一下。哈哈哈~~

body {
            margin: 0;
            padding: 0;
            background: #000;
        }
        
        a {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 200px;
            height: 60px;
            text-align: center;
            line-height: 60px;
            color: #fff;
            font-size: 24px;
            text-transform: uppercase;
            text-decoration: none;
            font-family: sans-serif;
            box-sizing: border-box;
            background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
            background-size: 400%;
            border-radius: 30px;
            z-index: 1;
        }
        
        a:hover {
            animation: ani 8s linear infinite;
        }
        
        @keyframes ani {
            0% {
                background-position: 0%;
            }
            100% {
                background-position: 400%;
            }
        }
        
        a::before {
            content: "";
            position: absolute;
            top: -5px;
            left: -5px;
            right: -5px;
            bottom: -5px;
            z-index: -1;
            background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
            background-size: 400%;
            border-radius: 40px;
            filter: blur(20px);
            opacity: 0;
            transition: 0.5s;
        }
        
        a:hover::before {
            filter: blur(20px);
            opacity: 1;
            animation: ani 8s linear infinite;
        }

效果

其中涉及到的不太經常使用的css屬性

• filter: w3c中filter(濾鏡) 屬性
• 線性漸變：w3c中的線性漸變
• animation：w3c中關於animation的定義