SCSS mixin for UI-Scaffolding

ui-scaffolding.scss

@mixin ui-scaffolding($color:"rgba(0,255,100)", $label:"PLACEHOLDER") {
  position: relative; 
  outline: 1px solid $color;
  background: rgba($color, 0.2);

  &:before {
    content: $label;
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    width: 200px;
    margin-left: -100px;
    margin-top: -10px;
    font-weight: bold;
  }
}