New editor panel navigation

styles/corner-buttons.scarlet

@@ -1,12 +1,19 @@
-.corner-buttons
+mixin corner-buttons
 	display flex
 	justify-content center
 	margin-bottom content-padding
-
+	z-index 1
 	position absolute
 	top content-padding
+
+.corner-buttons
+	corner-buttons
 	right content-padding
 
+.corner-buttons-left
+	corner-buttons
+	left content-padding
+
 .corner-buttons-hide-on-mobile
 	display flex
 	position absolute

styles/include/config.scarlet

@@ -78,8 +78,11 @@ calendar-entry-seen-hover-background = ui-background
 table-width-normal = 900px
 
 // Feature cards
-feature-card-color = hsl(348, 83%, 47%)
-feature-card-alternative-color = hsl(203, 83%, 47%)
+const feature-card-saturation = 83%
+const feature-card-lightness = 47%
+
+feature-card-color = hsl(348, feature-card-saturation, feature-card-lightness)
+feature-card-alternative-color = hsl(203, feature-card-saturation, feature-card-lightness)
 feature-card-icon-color = white
 
 // Loading animation