Superhero Child Theme – Customizing Header

First, I LOVE this theme. Thank you!

I’m new to CSS — sorry!

I’d like to make my header wider (1220px) and possibly taller (200px) although I may wait until I know more for the height change. I’ve watched tons of youtube videos and searched the forums, but I think I’m missing something.

I created a child theme. I have a style.css file. I’ve tried many variations, but my changes never stay saved. I’m doing something along these lines in the Editor section:

#element.style {
width: 1220px;
}
#masthead {
color: #FFFFFF;
margin: 25px auto;
max-height: 150px;
min-height: 50px;
width: 1220px;
}
article, aside, details, figcaption, figure, footer, header, hgroup, nav, section {
display: block;
}

Thanks for any help you can offer. Additionally, do you happen to know if anyone sells 30 minutes of wordpress design teaching at a time? I’d love to learn this is small does. I’m committed to getting it!

riseupknowing.com

Ravani