Mixins and Selectors - What is a Mixin?


#1

This exercise is pretty bugged. It keeps saying "Did you assign backface visibility to .front, .back?"
Here is my code:

mixin backface-visibility {
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  -moz-backface-visibility: hidden;
  -ms-backface-visibility: hidden;
  -o-backface-visibility: hidden;
}
@mixin stripes($direction, $width-percent, $stripe-color, $stripe-background: #FFF) {
  background: repeating-linear-gradient(
    $direction,
    $stripe-background,
    $stripe-background ($width-percent - 1),
    $stripe-color 1%,
    $stripe-background $width-percent
  );
}

@mixin transform($transformation) {
  transform: $transformation;
  -webkit-transform: $transformation;
  -moz-transform: $transformation;
  -ms-transform: $transformation;
  -o-transform: $transformation;  
}

@mixin photo-content {
  object-fit: cover;
}

//Add your own mixins here
@mixin backface-visibility {
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  -moz-backface-visibility: hidden;
  -ms-backface-visibility: hidden;
  -o-backface-visibility: hidden;
}

.notecard {
  width: 300px;
  height: 180px;
  border: 1px solid black;
  display: inline-block;
  margin: 20px;
  font-family: Roboto, sans-serif;
  box-shadow: 1px 1px 2px 2px rgba(0,0,0,.2);
  
  &:hover{
  	@include transform (rotatey(-180deg));  
	}	
  
  .front, .back {
    width: 100%;
    height: 100%;
    position: absolute;
    @include backface-visibility;
  }
  
  .front {
  z-index: 3;
  font-size: 20px;

    .word {
      display: block;
      text-align: center;
      position: relative;
      top: 40%;
    }    
  }
  
  
  .back {
  z-index: 1;
  word-wrap: break-word;
  line-height: 1.6;
    
    .definition {
      width: 100%;
      height: 100%;
            
      .photo {
        width: 60%;
        margin: 0px auto;
          
      }
    }
  }
}

What do I need to do?


#2

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