JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="ru">
    <head>
        <title>Испытание: строим сетку</title>
        <meta charset="utf-8">
    </head>
    <body>
        <div class="container">
        <header>
            <div class="position">
                <div class="one">
                <div class="title"><span>Header</span></div>
            </div>
            </div>
            <div class="wrapper_menu"><span class="menu">Menu</span></div>
            <div class="wrapper_promo">
                <div class="Promo1"><span class="pr">Promo 1</span></div>
                <div class="Promo2"><span class="pr">Promo 2</span></div>
            </div>
        </header>
        </div>
        
        
        
        
        
        Left
        Main
        Right
        Footer
    </body>
</html>

CSS

html,
body {
    margin: 0;
    padding: 0;
    
}

body {
    width: 450px;
    height: 335px;
    font-family: "Arial", sans-serif;
    font-size: 10px;
    color: white;
    
    
}

.container {
    margin: 0px auto;
    
    }
header {
    background-color: #34495e;
    height: 170px;
    
    
    }
    
.one {
    background-color: #c0392b;
    
    width: 353px;
    height: 33px;
     
    }
.title {
  padding-left: 10px;
  padding-top: 5px;
    }
.position {
    padding-top: 15px;
    }    
.wrapper_menu {
    margin-top: 10px;
    background-color: #3498DB;
    width: 450px;
    height: 35px;
    
    }  
.menu {
    display: block;
    padding-left: 60px;
    padding-top: 5px;
    }    

.wrapper_promo {
    width: 353px;
    
    padding-top: 10px;
    
    }

.Promo1 {
    float: left;
    width: 170px;
    background-color: #c0392b;
    height: 60px;
    
    }   
.Promo2 {
    float: right;
    width: 170px;
    height: 60px;
    background-color: #c0392b;
    margin-right: 0px;
    } 
.pr {
    display: block;
    margin: 5px;
    }
    


/*
    Используемые цвета:
    #34495e – мокрый асфальт
    #c0392b – красный
    #3498DB – синий
*/