The solution to the horizontal scroll bar and the tips for viewing the element structure in the web page

Scenario: A horizontal scroll bar appears on the web page, and a blank space appears on the right.

Solution: You can insert the following CSS styles into the web page to view the layout structure of web page elements

* {
    background: #000 !important;
    color: #0f0 !important;
    outline: solid #f00 1px !important;
}

 Conclusion: There must be an element that props up the page, just find and correct it.