Fix style regression

public/styles/kindling.css

@@ -289,6 +289,7 @@ span.large {
 .abs.pinned-to-bottom { position: absolute; }
 
 button.borderless { border: none; }
+button.squared { border-radius: 0; }
 button.in-stack { margin-bottom: .25em; }
 
 .squared { border-radius: 0; }