Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.14)
// Compass (v1.0.1)
// ----

// _variables.scss
$cor1: #FFF;
$cor2: #000;
$cor3: blue;

// _mixins.scss
@mixin clearfix() {
	&:before,
	&:after {
		content: " "; /* 1 */
		display: table; /* 2 */
	}
	&:after {
		clear: both;
	}
}

@mixin opacity($value){
  $IEValue: $value*100;
  opacity: $value;
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity="+$IEValue+")";
  filter: alpha(opacity=$IEValue);
}

// _extends.scss

%bloco-azul {
  background: $cor3;
  @include border-radius( 4px );
  text-align: center;
  font-size: 12px;
  color: $cor1;
  &:hover {
    background: $cor2;
  }
}

// _home.scss
.minha-classe-demo {
  width: 50%;
  float: left;
  
  @include clearfix(); // Clearfix mixin
  @include opacity( 0.95 ); // Opacity mixin
  @include %bloco-azul; // Extend da classe bloco-azul
}

SassMeister-output.css

Undefined mixin 'border-radius'.