I know it seem a detail but I was to the point to change the icon for an image.
The following suggestion is the last thing that bother me on that burger menu. You have to hover right on top of one of the 3 lines to have your hover effect.
The hover should be over the entire surface occupied by the bars. I try to add a hover on the .button itself (I try header-offcanvas-trigger, span.box...) , didn’t work,
• When your mouse go between the bars you have that flicker effect that doesn't look good.
Suggestion on the burger button: • Make the entire area of the burger trigger the pointer cursor
• Remove that opacity change, hard to find and not necessary..
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