recorder: highlight selected accordions

Author: bobrippling

apps/recorder/interface.html

@@ -49,6 +49,7 @@
       .accordion-header { cursor: pointer; padding: 10px; background: #f8f9fa; border-radius: 4px; }
       /* only show margin on expanded entries */
       input[name=accordion-tracks]:checked ~ .accordion-header { margin-bottom: 5px; }
+      input.select-checkbox:checked ~ div > .accordion-body { background: #f0f8ff; }
       .accordion-header:hover { background: #e9ecef; }
       .accordion-body { overflow: visible; }
       .track-content-wrapper {