Template:Syntaxhighlight tab size/styles.css

.syntaxhighlight-tab-size-8 .mw-highlight pre {
  tab-size: 8;
}

.syntaxhighlight-tab-size-6 .mw-highlight pre {
  tab-size: 6;
}

.syntaxhighlight-tab-size-4 .mw-highlight pre {
  tab-size: 4;
}

.syntaxhighlight-tab-size-2 .mw-highlight pre {
  tab-size: 2;
}