JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
        <li onmouseover="clip_1.src='http://3.bp.blogspot.com/-7VguOKQL_1A/TZCZqkhCJ8I/AAAAAAAAAEc/Hcch-vkZBMk/s1600/01_08_52---Duck_web.jpg'" onmouseout="clip_1.src='http://animal.discovery.com/guides/wild-birds/gallery/mallard_duck.jpg'">
            <img src="http://animal.discovery.com/guides/wild-birds/gallery/mallard_duck.jpg" name="clip_1">      
        </li>
        <li onmouseover="clip_2.src='http://3.bp.blogspot.com/-7VguOKQL_1A/TZCZqkhCJ8I/AAAAAAAAAEc/Hcch-vkZBMk/s1600/01_08_52---Duck_web.jpg'" onmouseout="clip_2.src='http://animal.discovery.com/guides/wild-birds/gallery/mallard_duck.jpg'">
            <img src="http://animal.discovery.com/guides/wild-birds/gallery/mallard_duck.jpg" name="clip_2">      
        </li>
    </ul>

CSS

li {
    width: 190px;
    border: 1px solid black;
    list-style: none;
}

li img{
    width: 100%;
}