* {
    box-sizing: border-box;
}

.column {
	background-color: cyan;
    float: left;
    width: 50%;
    padding: 10px;
}

.row:after {
    content: "";
    display: table;
    clear: both;
}
* {
    box-sizing: border-box;
}
.header {
    background-color: black;
    color: white;
    padding: 15px;
}
.footer {
    background-color: gray;
    color: white;
    padding: 15px;
}