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In particular, the CSS tags you're looking for are the following
width:<100%* for a full background or a smaller number for a smaller one, obviously; can use absolute number of px as well, like "1000px">;
background-image: url('<URL>');
background-color: <COLOR>; (this one is important if you want the background to have a color before the image loads)
padding:<#PX>; (usually around 10px to 30px is good) *you may find that 100% spills out of the PC themes, though.
Font-changing tags are also useful. Use the link Toujours posted to figure out how to do this more in-depth. An important one is text-align:<LEFT/RIGHT>; (because you are most likely centering the div)
And if you're using a number smaller than 100%, you'll probably want border: 1px solid black;
So, for example:
[CENTER][div=width:60%;background-image:url('https://30.media.tumblr.com/tumblr_lj7d9k1gyr1qig7uzo1_400.jpg');background-color:#EEEEEE;padding:30px;text-align:left;border:1px solid black;]Now this has a background. However, notice that it's not always nice to have backgrounds, since they often make text hard to read. A good way to bypass this is by either (1) fading your background or (2) nesting your CSS-divs (the latter is preferred).
[cd=padding:10px;background-color:lightblue;]Like this! It'll make your text a bit more readable. Just be sure to pick a nice color.
Use CSS sparingly, however, since it gets annoying fast if all your posts use it. Reserve it for thread openers and things of the like.[/cd]
[/div][/CENTER]
Now this has a background. However, notice that it's not always nice to have backgrounds, since they often make text hard to read. A good way to bypass this is by either (1) fading your background or (2) nesting your CSS-divs (the latter is preferred).
Like this! It'll make your text a bit more readable. Just be sure to pick a nice color.
Use CSS sparingly, however, since it gets annoying fast if all your posts use it. Reserve it for thread openers and things of the like.