Can you help me to fix my grid system?

Design help General
1

my image won’t fit to the grid and my colored boxes also don’t fit in the grid. Please help!

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

2

Hi, u can use a div for color (with color background)

and for grid this is my short tuto in sceen record
https://www.useloom.com/share/2b88904f94d14e30aafcb24ad28ba03b

3

Hello,
thank you so much for your help! I want the grid ratio to be 1:1 but I coudln’t find the way to do it… would you tell me how? I think I made the blocks either 1:1 ratio or 2:1 ratio, but now all of my blocks are not in the middle… ):