feat: responsive caption settings (#5534)

When responsive mode is set, make the caption settings dialog be more responsive to the size of the player.
Make whitespace and sizing a bit more consistent across elements.

Author: brandonocasey

src/css/components/_captions-settings.scss

@@ -26,30 +26,36 @@
   .vjs-text-track-settings .vjs-modal-dialog-content {
     display: grid;
     grid-template-columns: 1fr 1fr;
-    grid-template-rows: 1fr auto;
+    grid-template-rows: 1fr;
+    // Flex and Grid for Firefox, IE, and Edge remove the bottom padding/margin in a container as size decreases
+    // so we add bottom padding/margin to the last item in the grid instead of here
+    // see https://stackoverflow.com/a/23754080
+    padding: 20px 24px 0px 24px;
   }
 
-  .vjs-text-track-settings .vjs-track-settings-colors {
-    display: block;
-    grid-column: 1;
-    grid-row: 1;
-  }
-
-  .vjs-text-track-settings .vjs-track-settings-font {
-    grid-column: 2;
-    grid-row: 1;
+  // see the comment for padding above
+  .vjs-track-settings-controls .vjs-default-button {
+    margin-bottom: 20px;
   }
 
   .vjs-text-track-settings .vjs-track-settings-controls {
-    grid-column: 2;
-    grid-row: 2;
+    // make this take up both columns
+    grid-column: 1 / -1;
+  }
 
+  // 1 column for small players
+  .vjs-layout-small .vjs-text-track-settings .vjs-modal-dialog-content ,
+  .vjs-layout-x-small .vjs-text-track-settings .vjs-modal-dialog-content,
+  .vjs-layout-tiny .vjs-text-track-settings .vjs-modal-dialog-content {
+    grid-template-columns: 1fr;
   }
+
 }
 
 // Form elements
 .vjs-track-setting > select {
-  margin-right: 5px;
+  margin-right: 1em;
+  margin-bottom: 0.5em;
 }
 
 .vjs-text-track-settings fieldset {
@@ -62,6 +68,11 @@
   display: inline-block;
 }
 
+// style the second select for text colors
+.vjs-text-track-settings fieldset span > select {
+  max-width: 7.3em;
+}
+
 .vjs-text-track-settings legend {
   color: $primary-foreground-color;
   margin: 0 0 5px 0;