CSS Id and Classes
id and class selector
If you want to set CSS styles in HTML elements, you need to set “id” and “class” selectors in the elements.
id selector
The id selector can specify a specific style for the HTML element marked with a specific id.
HTML elements use id attributes to set id selectors, and id selectors in CSS are defined by “#”.
The following style rules apply to the element attribute id=”para1″:
Example
#para1
{
text-align:center;
color:red;
}class selector
The class selector is used to describe the style of a group of elements. The class selector is different from the id selector. Class can be used in multiple elements.
The class selector is represented by the class attribute in HTML, and in CSS, the class selector is represented by a dot “.”:
In the following example, all HTML elements with the center class are centered.
Example
.center {text-align:center;}You can also specify specific HTML elements to use class.
In the following example, all p elements use class=”center” to center the text of the element:
Example
p.center {text-align:center;}