i understand that it is the background but my question is the pointed side is going out of the page width, how ? I know it is an designed image with pointed corner but i put the image in the div, the div will be inside the page width but in your menu only the pointed side is going outside of the page width, that is what i want to learn. How it is done ? what is done in css to make this happen ?
Then open the page again and press F12, select on the left-middle of the screen, the arrow icon and select a part of the page and below you can see all css image info.