Help with coding on wordpress website

My first time on here ... I am building a new Wordpress website for my business using the Cutomizr Pro theme and BeaverBuilder plugin to help me with page layout. I am struggling with some minor tweaks. Currently I have two issues, but I am looking for someone who I can pay to assist me with other issues as they arise over the coming weeks. My website is password protected so search engines don't start indexing it until I am ready - so hopefully these screen grabs are sufficient to find someone who can assist me in the first instance. - My first issue is that on a mobile device the drop down (burger) menu has an unwanted green background and the text on top of it is green - not ideal. It displays perfectly fine on a laptop as the background is white. I would like to retain the green text. The website served on the mobile device seems to be pulling in the green background of the header that I have specified in the 'additional css' section of 'customize'. But this does not appear on my laptop. - My other issue is with spacing below embedded movies. As in there is too much and I can't seem to get rid of the excess space. I have played around with padding and margins within Beaver Builder but not overly sure what I am doing and not getting very far. I am using the embed text that Animoto is supplying me. In a nutshell I am hoping someone can assist me here and there as I really would like to build the bulk of the website myself, as I have a good bit of spare time over the winter period. I look forward to hearing from anyone interested. Regards ............. Marcus - Bay Tree Events