feat(colors): update default color palette

src/variables/modes/_dark.scss

@@ -5,5 +5,5 @@ $regular: #bbb;
 $deep: #ddd;
 $deeper: #fff;
 
-$border: hsla(0deg 0 75% / .3);
+$border: hsla(0deg 0 75% / .35);
 $border-rev: hsla(0deg 0 40% / .75);

src/variables/modes/_light.scss

@@ -1,9 +1,9 @@
-$shallowest: #f0f0f0;
+$shallowest: #f8f8f8;
 $shallower: #ddd;
 $shallow: #bbb;
 $regular: #555;
 $deep: #222;
 $deeper: #000;
 
-$border: hsla(0deg 0 25% / .3);
+$border: hsla(0deg 0 50% / .35);
 $border-rev: hsla(0deg 0 50% / .5);