You’re a champ.
Not sure of pixel height/depth...but it’s a 24” flat panel Viewsonic running 1920x1080 res.
Then the problem is the viewing properties of your browser.
The pic is only 1596 x 918
Save the pic and then set it as wallpaper...see what happens.
Then click on 'full screen button on left (a box with four arrows). Adjust the zoom as needed . Then press PrintScrn. Finally you need to paste it into a graphics program to save as a jpg or a bmp or what ever you need for your operating system.