[refactor] move edge shadow to variable

Author: zombieFox

src/css/edge.css

@@ -7,7 +7,7 @@
 left:0;
 opacity:0;
 border-radius:var(--theme-radius);
-box-shadow:inset 000var(--layout-line-width) rgb(var(--theme-accent)), inset 000calc(var(--layout-line-width) *4) rgba(var(--theme-accent),0.1), inset 000calc(var(--layout-line-width) *8) rgba(var(--theme-accent),0.1);
+box-shadow:var(--edge-shadow);
 z-index:var(--z-index-edge);
 pointer-events: none;
 transition: opacity var(--layout-timing-extra-fast);

src/css/variables.css

@@ -166,6 +166,8 @@
 --button-link-text-focus-hover:var(--theme-style-text);
 --button-link-text-active:var(--theme-style-text);
 --button-link-text-disabled:var(--theme-gray-04);
+/* edge */
+--edge-shadow: inset 000var(--layout-line-width) rgb(var(--theme-accent)), inset 000calc(var(--layout-line-width) *4) rgba(var(--theme-accent),0.1), inset 000calc(var(--layout-line-width) *8) rgba(var(--theme-accent),0.1);
 /* font */
 --font-regular:"Open Sans Regular", sans-serif;
 --font-bold:"Open Sans Bold", sans-serif;