Keep background on print

Signed-off-by: Pascal Syma <pascal@syma.dev>

src/assets/main.css

@@ -10,6 +10,11 @@
     display: none;
   }
 
+  * {
+    -webkit-print-color-adjust: exact;
+    print-color-adjust: exact;
+  }
+
   body {
     background-color: white !important;
   }