Skeleton FX Theme

[Arugula]

Hi, I'm back!  I received your email with the code to patch, and the fix worked perfectly.  
I enlose your email code here, so that others can use it.  
It seems the theme itself should be updated to include the fix.    (Remember the bug appeared on a clean new, basic, install of current version of getsimple, so it will effect most users.   If the bug is not appearing on your own site, then some plugin or tweak there must be resposnible. )

The fix  involes simply commented out on line,     /*position: fixed;*/
In the  class "offcanvas-bar" (on line 968) of main.less, then recompiling the style.css
Here then, is from your quoted email:

"Main problem with mobile Nav menu - is one CSS property:
position: fixed;
which is mixed with another property:
transform: translateX(0px);
I don't know for now why it not work on your site while on all my sites it works fine on 3 main browsers type.
So for quick responce you can just remark this property.
For this go to the theme admin page and in the area " LESS File Management" choose "main.less" file and push Edit button.
Find class with name "offcanvas-bar" (on line 968) and remark problematic property. So your block should look like this:
.offcanvas-bar {
   display: inline-block;
   /*position: fixed;*/
   top: 0;
   bottom: 0;
   left: -100%;
   z-index: 1001;
   width: 270px;
   max-width: 100%;
   background: @offcanv-bgr;
   overflow-y: auto;
   -webkit-overflow-scrolling: touch;
   -webkit-animation: slide-right 0.5s forwards;
   animation: slide-right 0.5s forwards;
}
Save changes and recreate CSS file in the block "Settings style.css".

"