recorder: narrow down css selector

Author: bobrippling

apps/recorder/interface.html

@@ -43,7 +43,7 @@
       #track-selector { margin-bottom: 20px; }
       .text-center { text-align: center; }
       .accordion-header i { transition: transform 0.2s; }
-      input:checked ~ .accordion-header i { transition: transform 0.2s; }
+      input[name=accordion-tracks]:checked ~ .accordion-header i { transition: transform 0.2s; }
       .accordion { margin-bottom: 20px; }
       .accordion-item { position: relative; }
       .accordion-header { cursor: pointer; padding: 10px; background: #f8f9fa; border-radius: 4px; margin-bottom: 5px; }