html {

    position: relative;

    min-height: 100%;

    margin: 0;

    background: white;

}

body {

    min-height: 100%;

}

.footer {

    position: absolute;

    left: 0;

    bottom: 0;

    width: 100%;

    padding: 15px 0;

    text-align: center;

    color: white;

    background: darkgray;

    font-size: 13px;

}