>>273764
w3schools

>>273764
I've seen hamburger menu icons made out of nested divs (then obviously css styles to look like hamburger menu icon)
Maybe you could try this.
But it's a lot of hassle for an ugly result if you don't mind my saying.

jsfiddle.net/osuc4vcv/

stacked boxes

Make a linear gradient background with lots of stops. Keeping hard edge might be tricky across browsers though.

>>274573
This

Alternatively don't use shit design and expect to duplicate it in pure CSS