div {
    font-family: Oswald;
    color: #333;
    text-align: center;
    text-transform: uppercase;
}

.wrapper::after {
    content: " ";
    display: table;
    clear: both;
}

.section {
    box-sizing: border-box;
    padding: 40px 10px;
    height: 200px;
    float: left;
    width: 33.333333%;
}

.b2 { background-color: #ddd;}
.b1, .b3 {background-color: #ccc; }
#header,
#footer{clear: both;}