@media only screen and (max-width: 1139px) {
    #header_main_alternate:after {
        content: "";
        background: white;
        display: block;
        height: 35px;
        width: 100%;
        position: absolute;
    }
}

Hello, I’m the Web Designer for this site.

The above code works to fix the problem, unfortunately the white space it creates still overlaps the slider. Is it possible to adjust the code to move the slider downwards when a second menu line is created?