HTML5 Lists [closed]

I'm doing a video site and wanted to put a page with several videos side by side, I tried to create div by div was right in my resolution but for other resolutions the content goes from the window, that's what I wanted arrange for example a list that went to the bottom of the page (on the x-axis) and skipped a line automatically, type one ul that on the x-axis and when it arrived at the bottom of the page it skipped a line with the rest of the videos.