霓虹灯特效按钮

效果：

html部分

<div class="body">
    <a href="#">Button</a>
    <a href="#">Button</a>
    <a href="#">Button</a>
</div>

css部分

.body{
     
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: #000;
    min-height: 100vh;
}
.body a{
     
    position: relative;
    padding: 10px 30px;
    margin: 40px 0;
    color: #21ebff;
    text-decoration: none;
    font-size: 20px;
    text-transform: uppercase;
    transition: 0.5s;
    overflow: hidden;
}
.body a:hover{
     
    background: #21ebff;
    color: #111;
    box-shadow: 0 0 50px #21ebff;
    transition-delay: 0.5s;
}
.body a:nth-child(1){
     
    filter: hue-rotate(115deg);
}
.body a:nth-child(3){
     
    filter: hue-rotate(270deg);
}
.body a::before{
     
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 10px;
    height: 10px;
    border-top: 1px solid #21ebff;
    border-left: 1px solid #21ebff;
    transition: 0.5s;
    transition-delay: 0.5s;
}
.body a:hover:before{
     
    width: 100%;
    height: 100%;
    transition-delay: 0s;
}
.body a::after{
     
    content: "";
    position: absolute;
    bottom: 0;
    right: 0;
    width: 10px;
    height: 10px;
    border-bottom: 1px solid #21ebff;
    border-right: 1px solid #21ebff;
    transition: 0.5s;
    transition-delay: 0.5s;
}
.body a:hover:after{
     
    width: 100%;
    height: 100%;
    transition-delay: 0s;
}