div.contentlogin {
    /* Location of the image */
    background-image: url(../../assets_sistema/media/fondo.jpg);
    /* Background image is centered vertically and horizontally at all times */
    background-position: center center;
    /* Background image doesn't tile */
    background-repeat: no-repeat;
    /* Background image is fixed in the viewport so that it doesn't move when 
     the content's height is greater than the image's height */
    background-attachment: fixed;
    /* This is what makes the background image rescale based
     on the container's size */
    background-size: cover;
    /* Set a background color that will be displayed
     while the background image is loading */
    /*background-color: #464646;*/
}