Source: http://quiroz.co/the-overlapping-divi-logo/

/* START overhanging logo */
#top-header {z-index: 99999;}
 
#logo {
    max-height: 220%;
    margin-top: -32px;
    z-index: 100000;
}
 
@media only screen and (max-width : 980px) {
    #logo { margin-top: 0px}}
/* END overhanging logo */
Code language: CSS (css)