JSFiddle - React, Tailwind, and code Playground

HTML

<div class="section_zone">
    <div class="box_frame" id="_15">inner box 1</div>
    <div class="box_frame" id="_15">inner box 2</div>
    <div class="box_frame" id="_15">inner box 3</div>
    <div class="box_frame" id="_15">inner box 4</div>
</div>

CSS

div.section_zone{
	margin: 0 auto;
    padding: 3px;
	width: 80%;   
	position: relative;
	overflow: auto;
	text-align: center;
	display: inline-block;
	clear: both;
    background-color: #fff;
    border: 1px solid #000;
    /* change border to be inside the box */
    box-sizing:border-box;
    -moz-box-sizing:border-box;
    -webkit-box-sizing:border-box;
}
div.box_frame{
	float: left;
	background-color: #eee; /* standard background color */
	border: 1px solid #898989; 
	border-radius: 11px;
	padding: 2px;
	margin: 0 5px;
	text-align: center;
	/* change border to be inside the box */
    box-sizing:border-box;
    -moz-box-sizing:border-box;
    -webkit-box-sizing:border-box;
}
div.box_frame:first-child{
	margin-left: 0;
}
div.box_frame:last-child{
	margin-right: 0;
    float: right;
}
div.box_frame#_15{ /* width 15% */
	width: 20%;
}