(css) Improve display of events in calendar views

UI/WebServerResources/scss/views/SchedulerUI.scss

@@ -258,6 +258,7 @@ $quarter_height: 10px;
     left: 0;
     right: 0;
     opacity: 0.9; // When events from a same calendar overlap, it creates a border to help distinguish the events
+    outline: none;
     user-select: none;
     transition: $swift-linear;
     $i: 0;
@@ -338,7 +339,9 @@ $quarter_height: 10px;
     }
 
     .material-icons {
-     font-size: $sg-font-size-2;
+      font-size: $sg-font-size-2;
+      min-height: $sg-font-size-2;
+      min-width: $sg-font-size-2;
     }
 
     .icons md-icon {