JSFiddle - React, Tailwind, and code Playground

HTML

<div class="opDiv">
    <img src="http://htmlbook.ru/themes/hb/images/forum.png" border="0" style="opacity: 1;"/>
</div>

CSS

.opDiv {
   width: 300px;
    height: 300px; 
    opacity: 0.3;
    background-color: black;
}