JSFiddle - React, Tailwind, and code Playground

HTML

<div class='container'>
    <img class='imgmy' src="http://seansimmonstravel.com.au/wp-content/uploads/2012/08/photodune-785712-hot-air-balloon-travel-over-andaman-sea-s.jpg">
</div>

CSS

.container {
    height:100%;
    width: 100%;
    border: 1px red solid;
    margin:0;
    padding:0;
    line-height: 0;
}
.container .imgmy{
   height:100%;
    width: 100%;
    margin:0;
    padding:0;
}