CSS describes the layout of a Web page

1.CSS format

CSS rules consist of two main parts: selectors, and one or more declarations; The CSS declaration always ends with a semicolon (;), and the declaration group is enclosed in curly braces ({}):

. Style{color:red;text-align:center;}

2.CSS Note:/**/

3.CSS Selector
The HTML element sets the ID selector with the id attribute, and the ID selector in the CSS is defined with "#"

#terminal {text-align:center;color:red;}

The class selector is represented in the HTML as a class attribute, and in CSS, the category selector takes a point "." Number Display

. center {Text-align:center;}

Specifies that a specific HTML element uses the class

p {text-align:center;}

4.CSS creation
There are three ways to insert a style sheet: inline style) inline style > (internal style) Internal style sheet > (external style) External style sheet > browser default style

External style sheet (External style sheet)

Internal style sheet (Internal style sheet)
100%float: left;width:63%; height:98%; margin-top:1%;margin-bottom:1%;margin-left:1%;margin-right:1%float: left;width:33%; height:98%; margin-top:1%;margin-bottom:1%;margin-left:1%;margin-right:1%;}. box {position:relative; background: #003; border-top:1px solid #d2d6de; border-top-color: # 383838;} </style>
Inline styles (inline style)
<div id= "full" class= "BigBox" style= "height:1000px;" >
CSS describes the layout of a Web page