JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
  border-radius: 15px;
    width: 600px;
    height: 200px;
    box-shadow: 0px 0px 10px black;  

    background: -moz-linear-gradient(left, 
                rgba(255, 255, 255, 0) 0%,
                rgba(255, 255, 255, 1) 100%
              ) white;
    -moz-transition: all 2s;  
}

div:hover {
    background: -moz-linear-gradient(left, 
                rgba(255, 255, 255, 0) 0%,
                rgba(255, 255, 255, 1) 100%
              ) black;
}