Removing navigation menu on mobile site

Site URL: http://www.stevedrewking.com

Hello

Would anyone be able to suggest how I can get rid of the burger menu on the mobile version of my website? (http://www.stevedrewking.com) Also I have two headers, does anyone know how to get rid of the smaller, first one?

I currently have 

Quote

.sqs-block-content hr{
  margin-top: 0px !important;
  margin-bottom: 0px !important;}

in my site CSS already. Any suggestions how to improve or add to this?

Many thanks

Steve

Add to Home > Design > Custom CSS

@media screen and (max-width:640px) {
span#mobile-navigation-label {
    visibility: hidden;
}
}