@mixin mix1
  list-style: none
  padding: 10px
  font-size: 20px
  background-color: yellow
@mixin mix2
  a
    display: block
    width: 100px
    text-decoration: none
    text-align: center
    padding: 10px
    margin: 5px
    color: black
    border: 1px solid black
    border-radius: 8px
    box-shadow: 1px 1px 6px rgba(0, 0, 0, 0.6)
    &:hover
      color: crimson

.css
  @include mix1
  @include mix2