JSFiddle - React, Tailwind, and code Playground

HTML

<div class="icon"></div>

CSS

.icon {
    -webkit-transition:all 400ms;   
    -moz-transition:all 400ms;
    -o-transition:all 400ms;
    transition:all 400ms; 
    display:block;
    width:100px;
    height:100px;
    background-color:red    
}

.icon:hover {
    -webkit-transform:rotate(-90deg);
}