How to expand links to the full width of a web page

HTML-CSS
1


Above is the link of my code
i want to expand my navigation link to its full width but when i’m doing so my drop-down menu is not displaying properly.

2

You could set the dropdown lis to be width 100%;

#nav_top li ul li { width: 100%; }

Keep in mind though that CSS dropdowns aren’t very accessible.