JSFiddle - React, Tailwind, and code Playground

HTML

<div id=bellnews>
</div>

CSS

#bellnews { 
 position: absolute;
 min-width: 140px;
 min-height:100px;
 background: #fff; 
 color: #000;
 border:1px solid #000;
}


#bellnews:before {
  content: "";
  position: absolute;
  top: -5px;
  vertical-align: middle;
  margin-left: 70px;
  width: 0; 
  height: 0; 

  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 5px solid black;
}