Sahifa Theme increase width customization

I am using the below Global CSS settings to increase the width of my Sahifa theme.

#main-content {width: 1330px;}
#sidebar {width: 250px;}
.content {width: 990px;}
header#theme-header {width: 1380px;}
.breaking-news {width: 1380px;}
.item-list { width: 289px; }

Refer to the attached screenshot. I need to fix a few problems:
(1) Home and random article had disappeared
(2) The "main content" width needs to be increased to account for the reduced sidebar
(3) The menu bar is sticky and scrolls down with the page as the user scrolls down the page but when it scrolls down, it reduces to the default width.

Please refer to the following website to see Sahifa in action