Demo uses "font-family: monospace"

Signed-off-by: Jack Cherng <jfcherng@gmail.com>

Author: jfcherng

example/diff-table.css

@@ -9,7 +9,7 @@
   border: 1px solid #000;
   color: #000;
   empty-cells: show;
-  font-family: consolas, pmingliu, simhei;
+  font-family: monospace;
   font-size: 13px;
   width: 100%;
   word-break: break-all;

example/diff-table.scss

@@ -19,7 +19,7 @@
   border: 1px solid $border-color;
   color: #000;
   empty-cells: show;
-  font-family: consolas, pmingliu, simhei;
+  font-family: monospace;
   font-size: 13px;
   width: 100%;
   word-break: break-all;