SASS supports the use of functions by providing some keyword arguments, which are specified using normal CSS function syntax.
p { color: hsl($hue: 0, $saturation: 50%, $lightness: 50%); }
HSL stands for hue, saturation, and lightness, which are more intuitive for creating a set of matching colors by using saturation and lightness.
hue − It represents the degree of color such as 120 for red, 240 for green, 290 for pastel violet etc.
saturation − It is a percentage value that increases the saturation of color.
lightness − It is a percentage value which decreases the lightness of color.
The following example demonstrates the use of functions in the SCSS file −
<html> <head> <title>Functions Example</title> <link rel = "stylesheet" type = "text/css" href = "style.css" /> <link rel = "stylesheet" href = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"> <script src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> <script src = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script> </head> <body> <div class = "container"> <h2>Example using Functions</h2> <p>SASS stands for Syntactically Awesome Stylesheet..</p> </div> </body> </html>
Next, create file style.scss.
Use the following SCSS code which defines the HSL function on the SASS code.
p { color: hsl(290,60%,70%); }
You can tell SASS to watch the file and update the CSS whenever SASS file changes, by using the following command −
sass --watch C:\ruby\lib\sass\style.scss:style.css
Next, execute the above command; it will create the style.css file automatically with the following code −
p { color: #d185e0; }
Let us carry out the following steps to see how the above given code works −
Save the above given html code in functions.html file.
Open this HTML file in a browser, an output is displayed as shown below.