Mixin Facts 5/9 - Stuck


Error: "Did you include the transition mixin with a total of 0.4s in main.scss?"


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

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

@mixin transition($time){
  transition: $time;
  -webkit-transition: $time;
  -moz-transition: $time;
  -o-transition: $time;

.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);
  @include transform-style(preserve-3d);
  @include transition(0.4s);
      @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;
  @include transform(rotatey(-180deg));  
    .definition {
      width: 100%;
      height: 100%;
      .photo {
        width: 60%;
        margin: 0px auto;

NOTE: This is the code generated after I clicked "Get Code", but I'm still stuck.

Stuck at 5/9 mixins and the & selector

try using chrome browser, i was using firefox and had the same problem. With chrome, it ran in the first try


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