The width of the page . When people preview a webpage, the display device resolution is 600 × 800 and 768 × 1024, and the width of the display device should be 800 and 1024 pixels. Since the horizontal and vertical scroll bars occupy about 20 to 40 pixels, the width of the page should be 780 pixels. Therefore, the main width of the webpage should be 780 pixels. In the process of using a display device to preview a webpage, the landscape can be better displayed on the display. When the page width is greater than 780 pixels, a horizontal scroll bar appears on the display device. If people need to use the scroll bar to understand and master all the data and information during the preview of the webpage, they can consider that the layout of the webpage lacks the corresponding rationality.