the feature where the button darkens when you hover over it is good as it can help people visually see where they are on the page. This helps those who are not that efficient in using the mouse.

The information is perceivable, there is a understandle hierchy that keyboard navigator would understand.

In the banner, the Flash Sale text is in a Yellow, one recommendation I would have would be to bold the coloured text to highlight it for those that are colour blind. You can still see the different but I would help.