css - 修改 CSS 中的一些属性以使按钮阴影自动发光，而不仅仅是在悬停时

Question

最后我正在开发一个网站，我将在这里用 CSS 实现一个小“按钮”。我的问题是：如何让它的阴影发光而不必将光标放在它上面并悬停？我希望它的影子自动发光。我试图从下面的代码中更改一些属性，但它不起作用。有人知道该怎么做吗？任何帮助表示赞赏:)

这是我尝试修改的一些代码片段：

html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    background: #000;
}

.glow-on-hover {
    width: 220px;
    height: 50px;
    border: none;
    outline: none;
    color: #fff;
    background: #111;
    cursor: pointer;
    position: relative;
    z-index: 0;
    border-radius: 10px;
}

.glow-on-hover:before {
    content: '';
    background: linear-gradient(45deg, #ff0000, #ff7300, #fffb00, #48ff00, #00ffd5, #002bff, #7a00ff, #ff00c8, #ff0000);
    position: absolute;
    top: -2px;
    left:-2px;
    background-size: 400%;
    z-index: -1;
    filter: blur(5px);
    width: calc(100% + 4px);
    height: calc(100% + 4px);
    animation: glowing 20s linear infinite;
    opacity: 0;
    transition: opacity .3s ease-in-out;
    border-radius: 10px;
}

.glow-on-hover:active {
    color: #000
}

.glow-on-hover:active:after {
    background: transparent;
}

.glow-on-hover:hover:before {
    opacity: 1;
}

.glow-on-hover:after {
    z-index: -1;
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: #111;
    left: 0;
    top: 0;
    border-radius: 10px;
}

@keyframes glowing {
    0% { background-position: 0 0; }
    50% { background-position: 400% 0; }
    100% { background-position: 0 0; }
}

<button class="glow-on-hover" type="button">HOVER ME, THEN CLICK ME!</button>

整个代码和我想要实现的确切按钮可以在以下位置找到：https ://codepen.io/leandrosimoes/pen/VqZxaG

标签： cssbutton