27/32 сетки 80% подскажите пожалуйста чего нехватает или что изменить.

Курсы §15. Сетки
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<body>
   <div class="wrapper"> 
  <div class="header">
    <div class="layout-positioner">
    Header
    </div>
  </div>
   </div> 
<div class="menu">
  <div class="layout-positioner">
  Menu
  </div>
</div>
<div class="promos">
  <div class="layout-positioner">
    <div class="layout-column-1 layout-column">Promo 1</div>
    <div class="layout-column-2 layout-column">Promo 2</div>
  </div>
</div>
<div class="features">
  <div class="layout-positioner"> 
    <div class="layout-column-1">Left</div>
    <div class="layout-column-2">Main</div>
    <div class="layout-column-3">Right</div>
  </div>
</div>
<div class="footer">
  <div class="layout-positioner">
  Footer
  </div>
</div>
  </body>
</html>

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

body {
width: 450px;
height: 335px;

font-size: 10px;
font-family: “Arial”, sans-serif;
color: white;
}

.wrapper {
padding: 10px 50px 10px;
background-color: #34495e;
}

.header {
padding: 5px 5px 20px;
background-color: #c0392b;
}

.layout-positioner::after {
content: “”;
display: table;
clear: both;
}

.layout-positioner {
width: 350px;
margin: 0 auto;
}

.menu {
padding: 0 50px;
background-color: #3498db;
}

.menu .layout-positioner {
margin: 0 auto;
padding: 5px 5px 15px;
}

.promos {
padding: 10px;
background-color: #34495e;
}

.layout-column {
min-height: 55px;
}

/Promo 1/
.layout-column-1 {
float: left;
background-color: #c0392b;
width: 165px;
padding-top: 5px;
padding-left: 5px;
}

/Promo 2/
.layout-column-2 {
float: right;
background-color: #c0392b;
width: 165px;
padding-top: 5px;
padding-left: 5px;
}

.features {
margin: 10px;
}

/*left main right */
.features .layout-column-1 {
float: left;
min-height: 95px;
background-color: #3498db;
width: 65px;
margin-right: 10px;
padding-top: 5px;
padding-left: 5px;
}

.features .layout-column-2 {
float: left;
min-height: 95px;
background-color: #3498db;
width: 185px;
margin-right: 10px;
padding-top: 5px;
padding-left: 5px;
}

.features .layout-column-3 {
float: left;
min-height: 95px;
background-color: #3498db;
width: 65px;
padding-top: 5px;
padding-left: 5px;
}

.footer {
background-color: #34495e;
padding: 5px 0px 20px;
}

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