* {
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;

}
html{
    height: 100%;
}
body {
    margin: 0;
    height: 100%;
}

header {
    overflow: hidden;
    background-color: #333;
}

header h1{
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

.column {
    float: left;
    height: 100%;
}
.column.data {
    width: 25%;
    background-color:#aaa;
    padding: 10px;
}

.column.info {
    width: auto;
    padding: 10px;
}

.column.form {
    width: 75%;
    padding: 10px;
}

.column.nav {
    width: auto;
    background-color:#aaa;
}

.nav a:hover {
    background-color: #ffe28c;
    color: black;
}

.nav a {
    color: #000000;
    padding: 16px;
    text-decoration: none;
    display: block;
}

.nav a:hover {
    background-color: #ffe28c;
    color: black;
}

.row{
    height: 100%;
}

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

footer {
    background-color: #f1f1f1;
    padding: 10px;
    text-align: center;
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 5rem;            /* Footer height */
}