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Mastering CSS with Sass: Crafting Reusable CSS using Mixins

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Hi folks,
Welcome again! I hope you are doing well. I am thrilled to see you here. Today, we’re taking a stride ahead in our journey to master CSS with SASS. Our focus will be on delving into the world of mixins.


As you know, Sass is a powerhouse that revolutionizes developers’ CSS writing. With its distinctive features and capabilities, Sass robustly streamlines, creating reusable and organized stylesheets. In this blog, we’ll delve into mastering CSS with Sass, particularly honing in on employing mixins to craft CSS code that’s both reusable and efficient.

What is Mixins?

Mixins are reusable blocks of CSS properties that can be included in multiple selectors. This permits applying a consistent set of styles to various elements without duplicating code, guaranteeing consistency and minimizing the chance of errors during codebase maintenance.

It comprises a collection of CSS declarations you can reuse throughout your stylesheet. This concept fundamentally transforms the way we write CSS by promoting code reusability and modularity. With mixins, developers can define a set of properties and apply them to various selectors, eliminating repetitive code and enhancing maintainability.

Creating and Using Mixins

Newer CSS features require time for full adoption and readiness in all browsers. As browsers incorporate features, CSS rules using them might require vendor prefixes, such as for box-shadow.

div {
  -webkit-box-shadow: 0px 0px 4px #fff;
  -moz-box-shadow: 0px 0px 4px #fff;
  -ms-box-shadow: 0px 0px 4px #fff;
  box-shadow: 0px 0px 4px #fff;

It’s a lot of typing to re-write this rule for all the elements that have a box-shadow or to change each value to test different effects. Mixins are like functions for CSS. Here is how to write one:

@mixin box-shadow($x, $y, $blur, $c){ 
  -webkit-box-shadow: $x $y $blur $c;
  -moz-box-shadow: $x $y $blur $c;
  -ms-box-shadow: $x $y $blur $c;
  box-shadow: $x $y $blur $c;

The definition starts with @mixin followed by a custom name, although the parameters (the $x$y$blur, and $c in the example above) are optional. Now any time a box-shadow rule is needed, only a single line calling the mixin replaces having to type all the vendor prefixes. Also, the mixin is called with the @include directive:

div {
  @include box-shadow(0px, 0px, 4px, #fff);

Advantages of Using Mixins

  1. Code Reusability: Mixins allow you to write styles once and apply them multiple times, promoting a DRY (Don’t Repeat Yourself) coding approach.
  2. Maintainability: All instances where a mixin is used reflect modifications to its properties, ensuring consistency and easy updates.
  3. Flexibility: Mixins can accept parameters, enabling dynamic customization of styles for different use cases.
  4. Organization: Mixins contribute to a well-structured stylesheet, making locating and modifying styles easier.


Sass has reshaped the CSS development landscape by introducing potent tools such as mixins. By adeptly mastering the application of mixins, developers can create CSS code that is not only reusable and efficient but also easily maintainable and This technique accelerates the styling process and nurtures a meticulously organized codebase. As the realm of web development undergoes constant evolution, honing skills in tools like Sass equips developers to lead the way, delivering exceptional web experiences. Thus, embark on mastering CSS with Sass, harnessing the power of mixins to achieve a streamlined and efficient CSS development process.

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Frontend Developer with around two years of Frontend experience at Knoldus in helping the company to develop and maintain a better code base for reusability. I have experience in technologies such as Angular, CSS, and Javascript, and I also worked on web and mobile automation using Selenium and Appium. I am always eager to tackle more complex problems and continue to find ways to maximize user efficiency.

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