JSFiddle - React, Tailwind, and code Playground

HTML

<div class="box">三边的box-shadow</div>

CSS

.box{
    box-shadow: 0px 10px 20px rgba(0,0,0,0.4);
    width:100px;
    height:200px;
    margin-left: 30px;
     border:1px solid #000;
}