Support selecting menu items

src/scss/card.scss

@@ -42,7 +42,7 @@
   opacity: 0.0;
 }
 .outer:hover + .hover-menu, .hover-menu:hover {
-  opacity: 1.0;
+  opacity: 0.9;
 }
 /* A relative div to place absolute picture elements onto */
 .picture-elements {

src/scss/menu.scss

@@ -4,12 +4,7 @@
   --frigate-card-menu-button-size: 40px;
   --mdc-icon-button-size: var(--frigate-card-menu-button-size);
   --mdc-icon-size: calc(var(--mdc-icon-button-size) / 2);
-  z-index: 10;
   opacity: 0.9;
-
-  // Necessary to mitigate an apparent Chrome opacity flickering bug caused by
-  // button ripples.
-  will-change: opacity;
  }
 
 .frigate-card-menu {