Misc fixes for event log.

  - Fixed single event log overflow.
  - Fixed incorrect class on log search filter button.
  - Fixed incorrect nested div.
  - Removed duplicate accordion trigger class in event log.
  - Fixed hover for checkboxes to be more prominent.
  - Fixed margin issue with action header for event log.

Change-Id: I156f516316675afde98c233057a8247bc17a1459
diff --git a/app/common/styles/components/form-elements.scss b/app/common/styles/components/form-elements.scss
index 3b88fd5..d674bbc 100644
--- a/app/common/styles/components/form-elements.scss
+++ b/app/common/styles/components/form-elements.scss
@@ -111,13 +111,14 @@
   width: 20px;
   height: 20px;
   background: $white;
-  border: 1px solid $medgrey;
+  border: 1px solid $lightbg__grey;
 }
 
 /* Hover and focus states */
 .control-check:hover input ~ .control__indicator,
 .control-check input:focus ~ .control__indicator {
   border: 1px solid $primebtn__bg;
+  background-color: $primebtn__bg;
 }
 
 /* Checked state */