html, body {
    margin: 0 0 0 0;
    padding: 0 0 0 0;
    background-color: #373737;
}

.container { 
    width: 100%;
    height: 100%;
}

.col-half {
    margin: 0;
    padding: 0;
    float: left;
    max-width: 50%;
    height: 100%;
}

.responsive-image {
    max-height: 100%;
    max-width: 100%;
    height: auto;
    width: auto;
}