JSFiddle - React, Tailwind, and code Playground

HTML

<stricken>HELLO</stricken>

SCSS

stricken {
    position:relative;
    font-size:50px;
    font-family:sans-serif;
    
    &:after {
        content:"=";
        position:absolute;
        left:0;
        right:0;
        top:32px;
        height:4px;
        background:#000;
        display:block;
    }
}