ID selector in CSS

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:

Website TipsMake.com

Note :

ID can be used with any HTML element.
ID names are only allowed to contain letters, numbers, underscores _ , hyphens - . ID names should not begin with numbers
ID values are case sensitive.
ID value must contain at least 1 character and no spaces.

For example:

TECHNOLOGY VILLAGE

TECHNOLOGY

SCIENCE - LIFE

Result:

ID selector in CSS Picture 1