Update testnet.html

testnet.html

@@ -9,10 +9,9 @@
             * {
                 box-sizing: border-box;
                 font-size: 1.15rem;
-                font-family: Arial, sans-serif;
+                font-family: monospace;
                 background-color: black;
                 color: white;
-                font-family: monospace;
             }
             html {
                 max-width: 70ch;