It's generally a good idea here to prefix this with & to limit this to this element. Like this, any buttons that are anywhere inside of the dialog will have this style applied.

```
.graphicsReplayArgumentsDialog {
  & .kButton { background-color: red; }
}
```
```
<div class="graphicsReplayArgumentsDialog">
  <div class="kButton"/> <-- this will be red
  <div>
     <div class="kButton"/> <-- this won't be red
  </div>
</div>
```