JSFiddle - React, Tailwind, and code Playground

HTML

<div id="genel">
    <div id="baslik"></div>
    <div id="blok-duzenle"></div>
    <div id="sag">fdgfg</div>
    <div id="sol">fdgfg</div>
    <div id="blok-duzenle"></div>
    <div id="footer"></div>
<div>

CSS

#genel {
	padding: 10px;
	height: 1200px;
	width: 1200px;
	margin-right: auto;
	margin-left: auto;
    background-color: #FFF;
	 border: 1px solid #CCC;
	border-radius:10px;
	-moz-border-radius:10px;
	-webkit-border-radius:10px;
	-webkit-box-shadow: 0 0 6px 4px black;
	-moz-box-shadow: 0 0 6px 4px black;
	box-shadow: 0 0 6px 4px black; 
}
#baslik{
height: 100px;
width: 1200px;
border: 1px solid #000;
}
#blok-duzenle {
	clear: both;
}

#sag {
	height: auto;
	width: 900px;
	float: left;
    border: 1px solid #000;
    margin-top:10px;
}
#sol{
	width: 290px;
	float: left;
    border: 1px solid #000;
    margin-top:10px;
    margin-left: 5px;
}

#footer {
	height: 20px;
	width: 1200px;
	margin-top: 10px;
    border: 1px solid #000;
}