JSFiddle - React, Tailwind, and code Playground

HTML

<div class="banner_holder">
    <img src="http://placekitten.com/g/800/600"/>    
</div>

CSS

.banner_holder{
    width: 100%;
    height: 300px;
    min-height: 200px;
    position: relative;
    outline:1px dotted red;
}

.banner_holder img{
    width: 100%;
}