How to create Side Navigation Push Opacity
Side Navigation Push Content opacity
Slides in the side navigation, and pushes the page content to the right, only this time, we add a black background color with a 40% opacity to the body element, to "highlight" the side navigation:
1- Set the width of the side navigation to 250px and the left margin of the page content to 250px and add a black background color to body
2-Set the width of the side navigation to 0 and the left margin of the page content to 0, and the background color of body to white.