Hi Loanna,
If you go to Appearance > Customize, you will see an option for Layout. There you can set your Main Content Width to a greater percentage. This will make your right side widget smaller and your main content area larger. Also, I would just verify you’re changing the padding on the main content element. Hope this helps!
Jason
Thank you Jason!
Looks like the problem was quite different cause the blog didn’t seem to understand the changes I made in style.css (increasing the padding and so on). Turns out a plugin was blocking the way…
Thank you so much for heplind me, changing the padding worked beautifully! 🙂