5. Mixin Facts (Error)



I have no idea why this doesn't work. I tryed almost everything. Is there a bug in this lesson mabye? Here's a screenshoot: http://image.prntscr.com/image/443690a694af4351ae7ff688e329d91b.png
I keep getting that 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;

Sass Bug in Mixin facts

I believe this is an error, and I reported it as such. I've been getting the same message, even after restarting the lesson and copy-pasting the snippets from the instructions verbatim it still doesn't allow me to run.


So, I finally gave in and asked to have the code generated for me, and it did work. The only problem it, I don't see any real difference between my code, your code, and the "correct" code. Maybe there's something that I'm missing, because I can't really spot the difference.


Same here.. I did the same as you.. Compared that code, with "generated" one. But I still belive that there is a chance that I'm missing something. :slight_smile:


I have the same error ("Did you include the transition mixin with a total of 0.4s in main.scss?") and have reported it as an bug in the lesson.

How do you get it to generate code for you? I would really like to continue on with the lesson.

(edit to add: Apparently I just need to hit RUN enough times for the system to realize I'm totally stuck. It's a shame I didn't think to copy my code and it was overwritten. Other than the order of my @mixins, I don't know what the difference was. I will know for next time. Anywho, moving on!)


I had the same issue, I fixed it by putting the: @include transition(0.4); outside the .notepad and before .front , .back { propertie I quess its a big that should be fixed.!!! @zigapovhe


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