In CSS, ID is used to style the element with the specified id. IDs are often used for objects that are unique in the website, each id name is unique to an element.

To declare ID in CSS, we use the following syntax:

 #ten_id { 
 định dạng các thuộc tính CSS 
 } 

For example:

 #quantrimang { 
  background-color: black; 
  color: white; 
  font-size: 30px; 

In HTML, the ID is open in the HTML tag with the syntax: id=ten_id .

For example:

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