JSFiddle - React, Tailwind, and code Playground

HTML

<body>
  <div id="container">
		<div id="header">
			<div id="logo"></div>
			<div id="tfheader">
		<form id="tfnewsearch" method="get" action="http://www.google.com">
		        <input type="text" class="tftextinput" name="q" size="21" maxlength="120"><input type="submit" value="search" class="tfbutton">
		</form>
	<div class="tfclear"></div>
	</div>
			<div id="topmenu">
	<ul>
    <li><a href="#">Home</a></li>
    <li><a href="#">About us</a></li>
    <li><a href="#">Portfolio</a></li>
    <li><a href="#">Contact us</a></li>
    <li><a href="#">FAQ</a></li>
</ul>
			</div>
  </div>
  <div id="intro">
	<div id="txintro"><h1>Lorem Ipsum</h1></div>
  </div>
   <div id="content">
   
   <div class="box">
   <h3><span>Список №1+</span></h3> 
   <ul>
   <li>Пункт №1</li> 
   <li>Пункт №2</li> 
   <li>Пункт №3</li> 
   <li>Пункт №4</li>
   </ul> 
   </div>
   <div class="box"> 
   <h3><span>Список №2+</span></h3> 
   <ul>
   <li>Пункт №5</li>
   <li>Пункт №6</li>
   <li>Пункт №7</li>
   <li>Пункт №8</li>
   </ul> 
   </div>
   
	<div class="banner"></div>

   </div>
   <div id="sidebar">
    Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
   </div>
   <div class="clear"></div>
   <div id="footer"></div>
  </div>

CSS

body {
    font: 10pt Arial, Helvetica, sans-serif; 
    background: #54463d;
    margin: 0;
   }
    #container {
    width: 700px; 
    margin: 0 auto;
    background: #f0f0f0; 
   }
   #header {
    background: #8fa09b; 
    font-size: 24pt; 
    font-weight: bold; 
    color: #edeed5;
    padding: 5px;
	height: 80px;
   }
   #content {
    float: left; 
    width: 120px; 
    padding: 10px; 
    background: #fff; 
   }
   #content p {
    margin-top: 0.3em 
   }
   #sidebar {
    float: left; 
    width: 500px; 
    padding: 10px; 
   }
   #footer {
    background: #8fa09b; 
    color: #fff; 
    padding: 5px; 
   }
   .clear { 
    clear: both;
   }
   #logo{
	background: red;
	float: left;
	width: 50%;
    height: 40px;
   }
   #topmenu{
    background: blue;
    float: left;
	width: 100%;
   height: 40px;
   }
   #tfheader{
		background-color:#c3dfef;
		width: 50%;
	   height: 40px;
	   float:right;
	}
   
   #tfnewsearch{
	float:right;
	margin-top: 10px
    background: green;
	}
	.tftextinput{
	vertical-align: top;
		margin: 0;
		padding: 5px 10px;
		font-family: Arial, Helvetica, sans-serif;
		font-size:14px;
		border:1px solid #0076a3; border-right:0px;
		border-top-left-radius: 5px 5px;
		border-bottom-left-radius: 5px 5px;
	}
	.tfbutton {
	vertical-align: top;
		margin: 0;
		padding: 5px 10px;
		font-family: Arial, Helvetica, sans-serif;
		font-size:14px;
		outline: none;
		cursor: pointer;
		text-align: center;
		text-decoration: none;
		color: #ffffff;
		border: solid 1px #0076a3; border-right:0px;
		background: #0095cd;
		background: -webkit-gradient(linear, left top, left bottom, from(#00adee), to(#0078a5));
		background: -moz-linear-gradient(top,  #00adee,  #0078a5);
		border-top-right-radius: 5px 5px;
		border-bottom-right-radius: 5px 5px;
	}
	.tfbutton:hover {
		text-decoration: none;
		background: #007ead;
		background: -webkit-gradient(linear, left top, left bottom, from(#0095cc), to(#00678e));
		background: -moz-linear-gradient(top, ...