JSFiddle - React, Tailwind, and code Playground

HTML

<div class="main-conteiner">
		<div class="block">this is just a div</div><!--   --><div class="block">this is another div</div>
	</div>

CSS

.main-conteiner {
				width: 600px;
				margin: 0 auto;
        
			}
			.block {
				width: 50%;
				display: inline-block;
				background: red;
				-webkit-box-sizing: border-box;
				box-sizing: border-box;
                -moz-box-sizing: border-box; 
			}
			div {
				margin: 0;
				padding: 0;
			}