JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<h1><a href="#">blabla</a></h2>
<ul>
<li><a href="#">1</a> </li>
<li><a href="#">2</a> </li>
<li><a href="#">3</a> </li>
<ul style="float: right; list-tyle-type: none;">
<li><a href="#">4</a></li>
<li><a href="#">5</a><li>
</ul>
</ul>

<div class="glowna">
<div class="lefty">
</div>
<div class="right">
</div>

<div class="middle">
</div>
</div>
</body>

CSS

ul{
list-style-type: none;
background-color: black;
margin:0;
padding:0;
height: 50px;
overflow: hidden;
}
li{
display: inline;
}

li a{
display: inline-block;
color: white;
text-align: center;
padding: 16px;
text-decoration: none;
}
li a:hover{
color: white;
background-color: green;}


h1 a{
color: pink;
text-decoration: none;
}

.glowna{
display: inline;}
.lefty{
width: 20%;
height:100%;
background-color: lightblue;
}

.right{
float: right;
width:20%;
height:100%;
background-color:lightblue;
}
.middle{
width:60%;
height:100%;
background-color: yellow;
}