add cover with toggle

src/scss/cover.scss

@@ -0,0 +1,18 @@
+.cover-container {
+  position: absolute;
+  top: -100%;
+  left: 0;
+  background-color: black;
+  width: 100%;
+  height: 100%;
+  opacity: 0.95;
+  transition: top 0.4s ease;
+  z-index: $overheader + 1;
+
+  color: $offwhite;
+
+  &.showing {
+    top: 0;
+    left: 0;
+  }
+}

src/scss/main.scss

@@ -16,3 +16,4 @@
 @import 'notification';
 @import 'scene';
 @import 'mediaplayer';
+@import 'cover';