Lockscreen CSS alterations

Hey there. I'm new to squarespace and don't know how to code so the best I can do is inject code where necessary by copy and pasting what someone else gives me. That much I know. What I'm trying to do is get some code that will accomplish a few things specifically on the lockscreen. I'm using the bailard template. 

The most important thing is changing the size of the "body" text on that lock screen. 

The other thing I'd like to do is for the entire lockscreen (linked background video and all) to initially fade in from black. No idea if that's even possible but it would be cool. On top of that having an audio file (linked externally from soundcloud or wherever) play as this all happens would be the icing on the cake. 

I don't know how much of this is actually possible to code so bare with me but any of it at all would be insanely helpful!

Thanks!

- Dan    (Tasmania/Australia)