Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.14)
// Compass (v1.0.3)
// ----

@mixin icon-base {
  background-size: contain;
  display: inline-block;
  height: 18px;
  width: 18px;
  vertical-align: top;
}

%icon-base {
  @include icon-base;
}

$icons: instagram twitter facebook mail;

@each $icon in $icons {
	.icon-#{$icon} {
		@extend %icon-base;
	}
}

SassMeister-output.css

.icon-instagram, .icon-twitter, .icon-facebook, .icon-mail {
  background-size: contain;
  display: inline-block;
  height: 18px;
  width: 18px;
  vertical-align: top;
}