JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

SCSS

div {
    position: relative;
    width: 250px;
    height: 150px;
    margin: 100px auto;
    
    border: 1px solid black;
    background-color: white;
    
    &:after {
        position: absolute;
        height: 80%;
        width: 10px;
        content: " ";
        right: 0px;
        top: 10%;
        background: transparent;
        box-shadow: 0 0px 10px rgba(0, 0, 0, 1);
        z-index: -1;
    }
}