Generated by SassMeister.com.

SassMeister-input-HTML.html

<div id="button-group">
  <button class="primary">Primary</button>
  <button class="secondary">Secondary</button>
  <button class="secondary">Secondary</button>
</div>

SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

$backgroundColor: lightGray;

body {
  background-color: $backgroundColor;
}

button {
    width: 200px;
    border: 2px solid;
    font-size: 24px;
    border-radius: 4px;
  }
@mixin sassyButton($width, $font-size, $color){
  @extend button;
  
  width: $width;
  font-size: $font-size;
  border-color: $color;
  background-color:lighten($color, 30%);
  color:darken($color, 10%);
  transition: box-shadow 1s, transform 1s  ease-in;

  &:hover{
      cursor:pointer;
      background-color: lighten($color, 40%);
      box-shadow: 4px 4px 8px gray;
      transform:rotate(360deg);

  }  
}
#button-group {
  .primary {
    @include sassyButton(200px, 40px, blue);
  }
  
  .secondary {
    @include sassyButton(250px, 30px, orange);
  }
}

SassMeister-output.css

body {
  background-color: lightGray;
}

button, #button-group .primary, #button-group .secondary {
  width: 200px;
  border: 2px solid;
  font-size: 24px;
  border-radius: 4px;
}

#button-group .primary {
  width: 200px;
  font-size: 40px;
  border-color: blue;
  background-color: #9999ff;
  color: #0000cc;
  transition: box-shadow 1s, transform 1s ease-in;
}

#button-group .primary:hover {
  cursor: pointer;
  background-color: #ccccff;
  box-shadow: 4px 4px 8px gray;
  transform: rotate(360deg);
}

#button-group .secondary {
  width: 250px;
  font-size: 30px;
  border-color: orange;
  background-color: #ffdb99;
  color: #cc8400;
  transition: box-shadow 1s, transform 1s ease-in;
}

#button-group .secondary:hover {
  cursor: pointer;
  background-color: #ffedcc;
  box-shadow: 4px 4px 8px gray;
  transform: rotate(360deg);
}

SassMeister-rendered.html

<div id="button-group">
  <button class="primary">Primary</button>
  <button class="secondary">Secondary</button>
  <button class="secondary">Secondary</button>
</div>