JSFiddle - React, Tailwind, and code Playground

HTML

<div class="box"><div class="strike"></div><span>37</span></div>

CSS

.box{
    width:40px;
    height:40px;
    border:1px #000 solid;
    overflow:hidden;
    position:relative;
    text-align:center;
    vertical-align:middle;
    
}
.strike{
    position:absolute;
    width:60px;
    height:1px;
    border-top:1px #000 solid;
     margin-top:20px;
    margin-left:-10px;
    -webkit-transform:rotate(-45deg);
    -moz-transform:rotate(-45deg);
    transform:rotate(-45deg);
   
    
}
.box span{
    vertical-align:middle;
    font-size: 26pt;
    color:red;
}