div { font-family: Oswald;
      color: #333;
      text-align: center;
      text-transform: uppercase; }
.section { height: 200px;
           margin-bottom: 10px;
           float: left;
           width: 33.333333%; }
.b2 { background-color: #ddd; }
.b1, .b3 { background-color: #ccc; }
.b4 { background-color: #c8d5f0;
      width: 240px;
      margin-top: 50px;
      clear: both; }

#header, 
#footer { 
    clear: both;
    width: 100%;
}