style: Update body and code font styles for improved UI consistency

client/src/index.css

@@ -1,3 +1,5 @@
+@import url('https://fonts.googleapis.com/css2?family=Silkscreen:wght@400;700&display=swap');
+
 * {
   margin: 0;
   padding: 0;
@@ -5,13 +7,12 @@
 }
 
 body {
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-  background: #0a0e1a;
-  color: #e0e0e0;
+  font-family: 'Silkscreen', 'Courier New', monospace;
+  -webkit-font-smoothing: none;
+  -moz-osx-font-smoothing: unset;
+  image-rendering: pixelated;
+  background: #2c2c2c;
+  color: #d4d4d4;
   overflow: hidden;
 }
 
@@ -21,5 +22,5 @@ body {
 }
 
 code {
-  font-family: 'Courier New', monospace;
+  font-family: 'Silkscreen', 'Courier New', monospace;
 }