I tried that and nothing changes it.
I’m in Mantra: style-mobile.css.
I replaced this code that’s under @media (max-width: 800px)
#header-container > div {
margin-top:7px;
margin-left:14px;
height:100%; }
To
#header-container { display: none; }
There are smaller displays but none of them have the header container.
I tried adding it to the custom css with no change. Tried adding it directly to the themes css.
I cleared my cache for the site. Clear it for the browser on the phone.
For some reason I just can’t get rid of it for mobile.