Various design improvements

pages/soundtracks/soundtracks.scarlet

@@ -1,3 +1,5 @@
+const soundtrack-margin = 1rem
+
 .soundtracks
 	horizontal-wrap
 	justify-content space-around
@@ -6,13 +8,18 @@
 	vertical
 	flex 1
 	flex-basis 500px
-	padding 1rem
+	margin soundtrack-margin 0
+
+> 500px
+	.soundtrack
+		margin soundtrack-margin
 
 .soundtrack-content
 	horizontal
 	border-radius ui-element-border-radius
 	box-shadow shadow-light
 	min-height 200px
+	overflow hidden
 
 	iframe
 		width 100%