JSFiddle - React, Tailwind, and code Playground

HTML

<br>
<center>

    <div id="star8"></div>
    
</center>

CSS

#star8 {
 border: 3px solid red;
 background: olive; 
 width: 80px;
 height: 80px;
 position: relative;
 -webkit-transform: rotate(20deg);
 -moz-transform: rotate(20deg);
 -ms-transform: rotate(20deg);
 -o-transform: rotate(20eg);
}
#star8:before {
 content: "";
 position: absolute;
 top: 0;
 left: 0;
 height: 80px;
 width: 80px;
 background: olive;
 -webkit-transform: rotate(135deg);
 -moz-transform: rotate(135deg);
 -ms-transform: rotate(135deg);
 -o-transform: rotate(135deg);
}