How to include one CSS file in another?

Is it possible to include one CSS file in another?
Yes, It is possible to include one CSS file in another and it can be done multiple times. Also, import multiple CSS files in the main HTML file or in the main CSS file. It can be done by using @import keyword.

Example 1:

HTML section: File name is index.html

<!DOCTYPE html>  
<html>  
    <head> 
    <!-- linking css file with html file -->
    <link rel="stylesheet" href="style1.css"> 
    </head>  
      
    <body>  
        <center>  
        <marquee><h1>GeeksforGeeks</h1> </marquee> 
        <div class="css1">GeeksforGeeks: It is a computer science 
        portal. It is an educational website. Prepare for the 
        Recruitment drive of product based companies like  
        Microsoft, Amazon, Adobe etc with a free online placement  
        preparation course. 
        </div>  
        </center>  
    </body>  
</html>                                 

Output: Without using CSS file

CSS section1: File name is style1.css

<!-- Including one css file into other -->
@import "style2.css"; 
   
 h1 { 
     color:green;    
 } 
   
.css1 { 
     color:black; 
     background-image: linear-gradient(to right, #DFF1DF, #11A00C); 
     position:static;    
 } 

Output: Using style1.css file without importing the second CSS file (style2.css).

CSS section2: File name is style2.css
body {

background:black;

opacity: 0.5;

}
Output:After importing the style2.css file into the style1.css file by using @import keyword.

Note: Many CSS file can be imported using one CSS file.

Example 2:

HTML Section: File name is Example.html

<!DOCTYPE html>  
<html>  
    <head>  
        <link rel="stylesheet" href="styl.css">  
    </head>  
    <body>  
        <h1>GeeksforGeeks<h1>  
        <div include="form-input-select()">  
            <select required>  
                <option value="">Example Placeholder</option>  
                  
                <!-- Available Options -->
                <option value="1">GeeksforGeeks</option>  
                <option value="2">w3skul</option>  
                <option value="3">tuitorial point</option>  
                <option value="4">CodeComunity</option>  
                <option value="5">Coders</option>  
            </select>  
        </div>  
    </body>  
</html>                                   

Output: Without using CSS file

CSS Section1: File name is style1.css
@import "style2.css";

body {

    border:black;

    justify-content: center;

    text-align: center;

}
Output: Using style1.css file without importing style2.css file.
CSS Section2: File name is style2.css
h1 {

    color:green;

    text-decoration: underline overline;;

}
Output:After using both CSS file (style1 and style2).

Note: There are two different ways to import a CSS file into another using @import url(“style2.css”); or @import “style2.css”; or directly import any CSS file or multiple CSS file in the HTML file directly within <style>@import “style1.css”; or .@import url(“style2.css”);</stlye> in head section.

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