fix: update brand-3

Author: akai

src/styles/var.less

@@ -3,7 +3,7 @@
 // Color Palette
 @brand-1: #ff5000;
 @brand-2: #ff9000;
-@brand-3: #fcf8ec;
+@brand-3: #fff9eb;
 @black: #000;
 @white: #fff;
 @gray-1: #111;