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Create a folder to hold your HTML file and background image. Put the background image into the HTML folder. Open a text editor or HTML Editor. Click File. Click Save As (Notepad) or Save (TextEdit). Type a name for the HTML document. Click Save.
On your computer, create and name a folder that you can easily find later. You can name the folder anything you like, but when working with HTML, it's best to get in the habit of naming files and folders with short, single word names that are recognizable. Put the image you'd like to use as background into the HTML folder. If you aren't too concerned with ensuring your website will run well on older devices with slower internet connections, you should be safe in using a higher resolution image as your background. Simple images with light, repetitive patterns are also a good choice when deciding on a background image so that you can read any text on top of it. You can create an HTML file using a basic text editor app such as NotePad on Windows or TextEdit on Mac You can also use a what-you-see-is-what-you-get (WYSIWYG) HTML editor such as Adobe Dreamweaver. If you are using a WYSIWYG editor, click the option to open a new HTML file on the start of the page. It's in the menu bar at the top of the page. It's in the file menu below. If you are using a PC, click Save As in the "File" drop-down menu. If you are using a Mac, click Save in the drop-down menu. Generally, the first page of a website is called "index", but you can the page anything you want. Type the name of the file in the text field next to "File Name". It's in the lower-right corner of the window. This saves the text document as an HTML document.