The following problem is that, when i’m opening ** page source** , i’m trying to see how my code is going. So i have the following problem. Why the heck my whole website is like 30% width of the page when i’m opening page source ?

How to be good at css and styling the webpage

This is my first question on here :).

1- I have a page called WelcomepageCont and it contains all the first content I need but now i want to expand my project and create another page and it has to be outside of this welcomePageCont so should I create a div called pages after the body to put all the pages i have and will created inside or it’s enough that the body is doing the capsulation

So I am trying to create a responsive grid layout for all screen sizes. When the screen size is decreasing the content in the grid are overflowing vertically. It’s as if the height of the columns in the last row are decreasing as seen in the attached picture. Can anyone help me fix this?Image of inspect

I can’t see the before implementation appear.