Сетки, 27/32 Помогите улучшить код


#1

Помогите улучшить код, сделал на 100%,но такое ощущение ,что задание выполнено из :poop: и палок

HTML
<head>
    <title>Испытание: строим сетку</title>
    <meta charset="utf-8">
</head>
<body>
    <div class="background clearfix">
      <div class="layout-header">Header</div>
      <div class="layout-menu">Menu</div>
      <div class="layout-promo1">Promo 1</div>
      <div class="layout-promo2">Promo 2</div>
    </div>
    <div class="background2">
      <div class="layout-left">Left</div>
      <div class="layout-main">Main</div>
      <div class="layout-right">Right</div>
    </div>
    <div class="layout-footer">Footer</div>
</body>
CSS

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

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

.clearfix::after {
content: “”;
display: table;
clear: both;
}

.background {
background: #34495e;
width: 450px;
}

.layout-header {
background: #c0392b;
height: 35px;
width: 350px;
float: left;
margin-top: 10px;
margin-left: 50px;
box-sizing: border-box;
padding: 5px;
}

.layout-menu {
background: #3498DB ;
float: left;
clear: both;
height: 35px;
width: 100%;
box-sizing: border-box;
margin-top: 10px;
padding-top: 5px;
padding-left: 55px;
}

.layout-promo1 {
clear: ;
float: left;
background: #c0392b;
height: 60px;
margin-top: 10px;
margin-left: 50px;
width: 170px;
box-sizing: border-box;
padding: 5px;
margin-bottom: 10px;
}

.layout-promo2 {
margin-top: 10px;
background: #c0392b;
float: left;
width: 170px;
margin-left: 10px;
height: 60px;
box-sizing: border-box;
padding: 5px;
margin-bottom: 10px;
}

.layout-left {
background: #3498DB;
margin-top: 10px;
float: left;
height: 110px;
margin-left: 50px;
width: 70px;
box-sizing: border-box;
padding: 5px;
margin-bottom: 10px;
}

.layout-main {
background: #3498DB;
margin-top: 10px;
margin-left: 10px;
float: left;
width: 190px;
height: 110px;
box-sizing: border-box;
padding: 5px;
margin-bottom: 10px;
}

.layout-right {
background: #3498DB;
margin-top: 10px;
float: left;
height: 110px;
margin-right: 50px;
width: 70px;
box-sizing: border-box;
padding: 5px;
margin-left: 10px;
margin-bottom: 10px;
}

.layout-footer {
background: #34495e;
clear: both;
width: 100%;
height: 35px;
box-sizing: border-box;
padding-top: 5px;
padding-left: 55px;
}


#2