JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
<div id="branding">
branding
</div>
<div id="content">
<div id="content_main">
<p>Ovo je neki tekst. Ovo je neki tekst. Ovo je neki tekst. Ovo je neki tekst. Ovo je neki tekst. Ovo je neki tekst.</p>
</div>
<div id="content_sub">
<ul>
<li>one</li>
<li>two</li>
<li>three</li>
</ul>
</div>
</div>
<div id="site_info">
<p>Ovo je neki tekst. Ovo je neki tekst. Ovo je neki tekst.</p>
</div>
</div>

CSS

body{
    font: 76%/160% Tahoma, Verdana, Arial, sans-serif;
    color: #5a1c46;
    text-align: center;
}

div#container{
    width: 780px;
    margin: 0 auto;
    padding: 0;
    text-align: left;
}

div#branding{
    /*when its display: none it is displaying correctly content*/
    position: absolute;
    z-index: 10;
    top: 0;
    left: 0;
    width: 100%;
    height: 200px;
    background-color: #009;
}

div#content{
    position: relative;
    width: 100%;
    overflow: auto;
    margin-top: 200px; /*this margin is ignoring while branding is visible*/
    min-height: 500px;
    background-color:#F00;
}

div#content_main{
    position: absolute;
    top: 0;
    left: 240px;
    width: 540px;
    margin: 0;
    padding: 0;
}

div#content_sub{
    position: absolute;
    top: 10px;
    left: 15px;
    width: 190px;
    margin: 0;
    padding: 10px;
    border-radius: 10px 30px 10px 30px;
    background-color:#Ff0;
}

div#site_info{
    margin: 0;
    padding: 0;
    min-height: 50px;
    border-radius: 0 0 20px 20px;
    width: 100%;
    background-color: #FF0;
}