Tài liệu Creating a Menu with CSS

The new menu you will be creating will have a significant
amount of CSS. To keep your design workspace clutter free let’s
go ahead and create a second CSS file. The great thing with
HTML is that you can have multiple CSS files in a single web
page.
Add the file “menu.css” to the CSS folder. Open “default.html”
and add the following link below your current “style.css” link:
<link href=“css/menu.css” rel=“stylesheet” type=“text/css”>
The next step is to create the images you will need in your
menu. Figure 2.15Proj shows a screenshot of the images and an
explanation for each image is as follows (see also Figure 2.16Proj):
1. center.png—center background image
2. center_hassub.png—center background image when you roll
cursor over it
3. left.png—left background image
Figure 2.14Proj The new menu
will start as a list with sublists