Whenever you need to style elements for certain breakpoints, e.g. large-up Screens, it is mandatory to use the app-mq() mixin.

Input

.c-content-teaser{
  margin-bottom: 30px;
  
  @include app-mq(large-up){
      margin-bottom: 50px;
  }     
}
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Output

.c-content-teaser {margin-bottom: 30px; }

@media only screen and (min-width: 48em) {
    .c-content-teaser {
        margin-bottom: 50px; 
    } 
}
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