How to reduce space between sidebar widgets

Hi there,

I need to:
1. Reduce the space between the sidebar widgets, as it looks quite messy.
(when I’ve tried to change the code nothing seems to happen)
2. Find out how to remove the border around the widgets. I changed the colour to white, but would prefer if it weren’t there.

I have tried looking for answers, but no success so far 🙁

I am using a bluchic template (Isabella) on iamchiclondon.com (self-hosted using wordpress).

Can someone please help me out? I’m pretty new to this so if you need further information, pls do let me know.

Thank you!