Content not showing well on mobile

I'm having issues with the web I'm working on mobile devices. In desktop looks perfect, also I resized the browser to the lowest width and still looks great, but on mobile is showing as a white big box to the right, like if is another content. Mobile View

As I said before on desktop it looks perfect, even if I resize the browser to the lowest. Desktop View

Honestly, I don't know what the problem is, I would appreciate the help a lot.