#scene_1 {
    height: 750px;  
    background-image: url('../img/founder-bg.jpg');
    background-size: cover; 
}
.header ul li { 
    z-index: 99;
}
.header { 
    height: 0;
    padding-top: 0;
    padding-bottom: 0;
}
.main {
     padding-top: 0px; 
}