The basic concept of CSS style sheets
A style sheet classification
1, the inline style sheet
<P style = "fint-size: 24px;"> be styled directly </ style> tags inside
2, embedded style sheet
<head>
<style type="text/css">
p / p * to the label name, what would you do this all the p tag style * /
{
style}
</style>
</head>
3, an external style sheet (the most common)
Create a new css file, you need to call in html css style sheet file, you need to click on the right -css style in html file - Attach Style Sheet. With a link link
* / * Remove all labels spacing, margins *,
{
margin：0px;
padding:0px;
}
Second, the selector
1, class selector may use a plurality of
<style>
.main
{
height:100px;
width:100%;
text-align:center;
}
</style>
<body>
<Div class = "main"> <div> call class Style Sheets
</body>
</body>
2, ID may be used only once selector
<style>
#a
{
width:100%;
height:100px;
backgroun-color:red solid 2px;}
</style>
<body>
<div id="a"><div>
</body>
3, the composite selector
1) p, span two kinds of tags using both styles look
{
style}
2) p .main be used when referring to .main .main styles included in the style tag label p
<Div class = "main"> <p> </ p> </ div> p div tag tag attributes
3) p.sp (SELECT) to perform "class =" sp "this style tags within all p
<P class = "sp"> <p> This use of the label
<P> </ p> is not used on the label