added the new color

Author: imadx

src/styles/_mixins/_variables.scss

@@ -47,6 +47,7 @@ $tc-orange: #fb7d22;
 $tc-yellow: #fce217;
 $tc-black: #262628;
 $tc-gray-90: #37373b;
+$tc-gray-85: #4f4f4f;
 $tc-gray-80: #47474f;
 $tc-gray-70: #5d5d66;
 $tc-gray-60: #747480;