JSFiddle - React, Tailwind, and code Playground

HTML

<div class="image"></div>

CSS

.image {
    width: 200px;
    height: 200px;
    position: relative;
    
    background: #eee;
    bottom: 1px solid  #333;
}
    .image:before,
    .image:after {
        position: absolute;
        width: 50px;
        height: 20px;
    
        content: '';
        
        background: #000;
    }
    .image:before {
        top:-2px;
        left: -17px;
        transform: rotate(135deg);        
    }
    .image:after {
        right: -17px;
        bottom: 0;
        transform: rotate(135deg);
    }