What is a Mixin? lesson isn't reading the code properly

<PLEASE USE THE FOLLOWING TEMPLATE TO HELP YOU CREATE A GREAT POST!>

<Below this line, add a link to the EXACT exercise that you are stuck at.>
https://www.codecademy.com/en/courses/learn-sass/lessons/mixins-and-parent-selector/exercises/mixins

<In what way does your code behave incorrectly? Include ALL error messages.>
I have typed in exactly what it asked, but it kept asking me “Did you assign backface visibility to .front in main.scss?” So I clicked “Get Code” after failing multiple times, copied the correct code and pasted it after resetting the exercise and still failed.

```

@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;
      
  }
}

}
}

<do not remove the three backticks above>

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