CSS实现按钮霓虹效果

实现代码

.light-btn {
    text-decoration: none;
    position: absolute;
    left: 50%;
    top: 80%;
    transform: translate(-50%, -50%);
    font-size: 24px;
    background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
    background-size: 400%;
    width: 400px;
    height: 100px;
    line-height: 100px;
    color: #fff;
    text-align: center;
    text-transform: uppercase;
    border-radius: 50px;
    z-index: 1;
}

    .light-btn:hover::before,
    .light-btn:hover {
        animation: sun 2s linear infinite;
    }

    .light-btn::before {
        content: '';
        position: absolute;
        left: -5px;
        right: -5px;
        top: -5px;
        bottom: -5px;
        background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
        background-size: 400%;
        border-radius: 50px;
        filter: blur(10px);
        z-index: -1;
        animation: sun 12s linear infinite;
    }

@keyframes sun {
    100% {
        background-position: -400% 0;
    }
}