I'm looking for something that only happens when 2 classes are present.
Eg:
.positive{
  color:#46a546;
}
.positive:after{
  content: "\25b2";
}
.negative{
    color:#F00;
}
.arrow:after{
  content: "\25bc";
}
<span class="positive"> hi </span>
<span class="positiveArrow"> hi </span> 
<span class="negativeArrow"> hi </span> //what i have
<span class="positive arrow"> hi </span>
<span class="negative arrow"> hi </span> // what i want
 
    