Edited the Dawn theme header to include the predictive search bar but cannot get the submenu working

[Lew2234]

As you can see on the screenshot the submenu is not working properly, please can anyone advise the necessary code change to fix this? 

https://prnt.sc/201p9ac

https://bargaincabin.co.uk

password: skunen

Thank you.

[Lew2234]

Partially fixed by extending width and adding a bit of margin-top...