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Sass @extend and Inheritance


Sass @extend Directive

The @extend directive lets you share a set of CSS properties from one selector to another.

The @extend directive is useful if you have almost identically styled elements that only differ in some small details.

The following Sass example first creates a basic style for buttons (this style will be used for most buttons). Then, we create one style for a "Report" button and one style for a "Submit" button. Both "Report" and "Submit" button inherit all the CSS properties from the .button-basic class, through the @extend directive. In addition, they have their own colors defined:

SCSS Syntax:

.button-basic  {
  border: none;
  padding: 15px 30px;
  text-align: center;
  font-size: 16px;
  cursor: pointer;
}

.button-report  {
  @extend .button-basic;
  background-color: red;
}

.button-submit  {
  @extend .button-basic;
  background-color: green;
  color: white;
}

After compilation, the CSS will look like this:

CSS Output:

.button-basic, .button-report, .button-submit {
  border: none;
  padding: 15px 30px;
  text-align: center;
  font-size: 16px;
  cursor: pointer;
}

.button-report  {
  background-color: red;
}

.button-submit  {
  background-color: green;
  color: white;
}

By using the @extend directive, you do not need to specify several classes for an element in your HTML code, like this: <button class="button-basic button-report">Report this</button>. You just need to specify .button-report to get both sets of styles.

The @extend directive helps keep your Sass code very DRY.


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