Determine theme in stylesheet

I know how to add the md-only and ios-only classes, but is it possible to do this in a stylesheet too?

For example if I have the following CSS:

.label-buttons {
  background-color: #C7D406;	
  box-shadow: 0px 6px 9px #0000004D;
  font-size: 9px;

How can I set the font-size to 9px for MD but 11px for iOS?


.ios .label-buttons {
  font-size: 11px;
.md .label-buttons {
  font-size: 9px;
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