Hi Timer,
first of all: a question is never dumb
The Skylar template, like nearly every template of J51, gives the possibility to write the own CSS to a custom.css file.
To activate this possibility goto your administration and then to
Extensions > Templates > J51 Skylar
In the template there is a tab called
CUSTOM CSS. At "Load custom.css" switch from
"No" to
"Yes".
Now you should add a new file, called custom.css, to your
template/j51_skylar/css/ folder.
I do this with a FTP program like Filezilla for example.
If you are not used to a FTP program, I recommend to get in touch with such a program. FileZilla is free and a very good tool and you find it here:
https://filezilla-project.org/
If you have this custom.css file you should place every change in styles to this file. You need no HTML styles declaration like
<style type="text/css"> </style>.
Just write the classes in this file.
The big advantage is that it will not be overwritten if you update the template. And you can do all changes here. With such a custom.css (which can be found in nearly every template of every template company) you can change the style of a template completely.
If you change nexus.css or template.css all your changes are gone after you update the template.
So I recommend NEVER change any of the css files except of your own custom.css.
A good CSS tutorial you can find here:
https://www.w3schools.com/css/default.asp.
We talked about changing the margins. Everything about css margins you can find here:
https://www.w3schools.com/css/css_margin.asp
Hope this helps.
Regards
Oliver