Single-page sites and the use of the parallax effect. The parallax effect is as follows: due to the different speeds of the layers of the layout when scrolling the page, there is an amazing effect of depth and perspective. This attracts the attention of visitors, and due to the fact that on such sites the menu is usually fixed (for example, from above or from the side) and does not disappear when scrolling. The navigation block is positioned relative to the browser window, not the page. Therefore, when scrolling the page, the block remains in its place, unlike the rest of the content that moves. Thus, the visitor does not need to scroll up to get to the menu and go to another section of the site. Fixing the block with the menu provides the visitor with convenient navigation on each page of the site.