Modify the default template layout

[Taquinho Costa]

I'm new to prestashop and wanting to modify some details in the default layout that comes with the installation.
I need to change colors, logo size and other things.
I found that the "theme.css" file contains all the configuration, but it is on a single line. From line 72 onwards, there is 01 kilometer of code without separation and therefore very difficult to modify (perhaps this is the intention). Does anyone know any easier way to modify?
Thank you in advance for your help.

Edited November 11, 2021 by Taquinho Costa
translation (see edit history)

[El Patron]

Hi, the default theme is not very  good, it does not have really any built in feature to manage your content.  You should consider once you have your catalog built buying a high quality theme that will include those tools.  the default theme is to get you one started but is 'not' something you want to build a business with.  I even recommend hiring the theme dev to install/configure for you.

as for your question, use chrome devtools to find where files are (.css)

https://developer.chrome.com/docs/devtools/