Improve text and link contrast ratio

default_app/index.html

@@ -3,7 +3,7 @@
   <title>Electron</title>
   <style>
     body {
-      color: #205161;
+      color: #3a585f;
       font-family: Roboto, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI", "Oxygen", "Ubuntu", "Cantarell", "Open Sans", sans-serif;
       margin: 0;
       display: flex;
@@ -67,7 +67,7 @@
 
     a,
     a:hover {
-      color: #2ab0cb;
+      color: #5667bd;
       text-decoration: none;
     }