Dry Up SCSS With Mixins

If you have a similar chunk of styling that is being duplicated across your CSS, you'd probably like to dry it up to reduce the pain of maintaining it. Mixins provide one way of dealing with this problem.

First, declare a named mixin of the styles that you are trying to dry up.

@mixin navigation {
  nav {
    display: flex;
    justify-content: space-around;

    ul {
      list-style: none;

      li a {
        text-decoration: none;
      }
    }
  }
}

Then, this mixin can be included wherever it is needed.

div.base-nav {
  @include navgation;
  background-color: #fff;
  color: #444;

  nav ul {
    li a:hover {
      color: #222;
    }
  }
}

div.admin-nav {
  @include navgation;
  background-color: #000;
  color: #fff;

  nav ul {
    li a:hover {
      color: #ddd;
    }
  }
}

Any subsequent changes to the core navigation styling only need to be made in one place, the mixin.

source

h/t Dorian Karter