#main-application {
    background-image: linear-gradient(to left top, #d4d4d4, #f5f5f5, #d4d4d4, #f5f5f5, #ffffff);
}

#main-application > section:first-child{
    background-image: url('../../image/bgs/bg-lines-3.png');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center 5em;
}