Page is too wide, empty space on the right side

This is my first time creating a website. Everything is perfect when I check preview. But after I publish it, I ran into two issues.

The right side of my page is too wide and I tried to change the overflow of other elements, I checked if all my sections are within the width I want it them to be. Everything except for the blue rectangle at the bottom is fine. If I make the image or the Div Block smaller, when I publish it, it only covers half the page width.

Any help would be much appreciated. Thank you!

Here is my site Read-Only:

You’ve got 1000px width on .heading-h5

See whether this is the reason.

No, that doesn’t seem change anything. I tried changing that