JSFiddle - React, Tailwind, and code Playground

HTML

<div id="abi">ABI</div>
<div id="number">12/19</div>

CSS

div{
    float:left;
    height:60px;
    line-height:60px;
    font-size:20px;
    margin:0;
    padding:0;
}
#abi{
    width:75px;
    background:gray;
    color:blue;
    padding-left:25px;
    position:relative;
    z-index:2;
    -webkit-border-radius: 5px 0 0 5px;
border-radius: 5px 0 0 5px;
}
#abi:after{
    content:"";
    position:absolute;
    right:-10px;
    top: 19px;
    width: 0; 
	height: 0; 
	border-top: 11px solid transparent;
	border-bottom: 10px solid transparent;
	border-left: 10px solid gray;
}
#number{
    width:155px;
    text-align:right;
    padding-right:25px;
    background:blue;
    color:gray;
    -webkit-border-radius: 0 5px 5px 0;
border-radius: 0 5px 5px 0;
    
}