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CSS to reference another CSS
.t-button
{
    border-color: #a7bac5;
    color: #333;
}

button, input[type="button"], input[type="submit"]
{
  /*apply "t.button" */
}

.rounded-corners (@radius: 5px) {
  border-radius: @radius;
  -webkit-border-radius: @radius;
  -moz-border-radius: @radius;
}

#header {
  .rounded-corners;
}
#footer {
  .rounded-corners(10px);
}

.error {
  border: 1px #f00;
  background: #fdd;
}

.badError {
  @extend .error;
  border-width: 3px;
}