Hover colour-change not working on nav-bar AND footer background not working.

Hey can anyone have a look at my code on CodePen and see where I am going wrong? I have a drop down menu on the navbar when the screen is reduced, but the ul list a:hover is acting a little strange and highlighting to a different colour on the first option only for a little while and it completely does not highlight on the second option in the menu.

My second problem is the footer where the background colour is not adapting to grey even when the width is spanned 100%.

Here you'll find my code:

https://codepen.io/nazaladdin/pen/rLvkzV

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