Drop down responsive

Hello Everyone.

Please could anyone help with my drop down dilemma? I have a few links in my navbar that is drop down but in mobile, these all go pear shape. I am needing all the menu items to be centered on mobile when opening the navbar. the “portfolio” drop-down is completely messed up. I think I’ve played around too much now its gone completely wrong. Could anyone please help with this.

Many thanks from Cape Town, South Africa

here is my link to project


Here is my site Read-Only: LINK
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Set ‘dropdown toggle 5’ in Style - Typography - align - center