A simple example of the web page effect displayed when a full screen image is opened up or down.

A simple example of the web page effect displayed when a full screen image is opened up or down.

The source code shows the effect:

<! DOCTYPE html> 

The problem that the content on the webpage is not displayed in full screen
This is mainly about the screen resolution. The display on the wide screen is the blank content on both sides. There is a rule for website production that the page width is limited to adapt to the resolution of different monitors, it can be displayed completely. You don't need to pull the left and right sides, just slide up and down. If you don't want to see the left and right blank, you can adjust the display resolution, but it will look more uncomfortable because the image will become wider, you can also press ctrl + the mouse pulley to change the page percentage.

How to enable the full screen display of the webpage content on Samsung 22
I don't know what the landlord actually expresses. Does it mean that the content on the webpage is full of up and down on the screen? If this is the meaning of the landlord, it is basically impossible.
Generally, the webpage design is fixed in width. The mainstream webpage width is usually around 1000 pixels and displayed in the center. Therefore, no matter how you adjust the browser, you will find that the content of the webpage is in the middle of the browser. Of course, if the browser is smaller than the webpage width, a horizontal scroll bar will appear. If you are a 22-inch Monitor, a large white space will be left in the left and right corner of the browser when the browser is full screen.
There are only a few website pages, no matter how big your browser is, it will be full. In this case, the content is relatively simple, or there are few elements. In web page design, if the browser size changes, the web page will also adapt to it, there will be many unexpected situations in this layout, so it is generally designed to be fixed width.
The shortcut key is F11 if the browser is full screen.