Fix missing video player styles, fix notification icon color

app/styles/application.scss

@@ -67,3 +67,4 @@
 @import 'components/spoiler-button';
 @import 'components/media-spoiler';
 @import 'components/error-boundary';
+@import 'components/video-player';

app/styles/ui.scss

@@ -413,7 +413,7 @@
     border-radius: 8px;
     text-align: center;
     color: #fff;
-    background: var(--brand-color);
+    background: var(--accent-color);
 
     @media screen and (max-width: 895px) {
       top: 0;