1、优化横线设置

lib/common/gaps.dart

@@ -40,7 +40,7 @@ const Widget vGap70 = SizedBox(height: 70.0);
 const Widget vGap80 = SizedBox(height: 80.0);
 const Widget vGap150 = SizedBox(height: 150.0);
 
-Widget line({height = 1.5}) => Divider(height: height);
+Widget line({height = 1.5, Color? color}) => Divider(height: height, color: color, thickness: height);
 
 const Widget vLine = SizedBox(
   width: 0.6,