size of website

Hello,

i need help m using frontier theme in most of my blog, but i need to know can i change the website width to fitted to the screen if it is possible so let me know because i saw many blogs they are using the same theme but the height of page is fitted to screen… thanks

this is the url of blog which are on Frontier theme
https://thefootballstars.com/

The page I need help with: [log in to see the link]