id in css

1css
2.class
3#id

1#id{
2    color:red;
3}

1<style>
2	#your_id{
3		color: blue;
4		font-size: 24px;
5	}
6</style>
7<h1 id="your_id">Example text</h1>

1/*put a # infront of the id*/
2/*<section id="example"></section>*/
3#example{
4	margin: auto;
5}

1<style>
2  #selector {
3  color: red;
4}
5/* # is id selector */
6</style>
7
8
9<div id="selector">
10<p>This is an id</p>
11</div>
12
13

1
2#id {
3  css declarations;
4}
5Demo
6