Revert vendor prefix removal

src/elements/emby-button/emby-button.css

@@ -9,6 +9,9 @@
     font-family: inherit;
     color: inherit;
     outline-width: 0;
+    -moz-user-select: none;
+    -ms-user-select: none;
+    -webkit-user-select: none;
     user-select: none;
     cursor: pointer;
     z-index: 0;
@@ -21,6 +24,8 @@
     outline: none !important;
     position: relative;
     font-weight: 600;
+    /* Disable webkit tap highlighting */
+    -webkit-tap-highlight-color: rgba(0,0,0,0);
     text-decoration: none;
     /* Not crazy about this but it normalizes heights between anchors and buttons */
     line-height: 1.35;
@@ -94,6 +99,9 @@
     font-size: inherit;
     font-family: inherit;
     color: inherit;
+    -moz-user-select: none;
+    -ms-user-select: none;
+    -webkit-user-select: none;
     user-select: none;
     cursor: pointer;
     z-index: 0;
@@ -110,6 +118,8 @@
     position: relative;
     overflow: hidden;
     border-radius: 50%;
+    /* Disable webkit tap highlighting */
+    -webkit-tap-highlight-color: rgba(0,0,0,0);
     justify-content: center;
     transform-origin: center;
     transition: 0.2s;