How to make fixed menu did not hide the scrolling part?

There is a window that extends for a whole page to replace the scroll from its body.
In the window there is a set menu, the width of which should also be the full width of the window.
But the menu overlaps the scrolling window.
July 8th 19 at 11:15
2 answers
July 8th 19 at 11:17
1) Make the width of the given scroll
2) Scrolling to do container, and the menu display on it
<section class="redactor">
 <div class="menu"></div>
 <div class="container">

That is, to indent from the right edge? In different browsers because of different width of the scrolls in mobile so far it is not. - clemens.Durgan68 commented on July 8th 19 at 11:20
July 8th 19 at 11:19
Article how to do: Habr
The demo is what you get:

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