Improve responsiveness for tablet and below of navbar in carousel example

- Remove margin-top of navbar-wrapper
- Remove border radius of navbar
- Space out the carousel

docs/examples/carousel.html

@@ -189,6 +189,18 @@ body {
     font-size: 18px;
     line-height: 1.5;
   }
+  
+  .navbar-wrapper {
+    margin-top: 0;
+  }
+
+  .navbar {
+    border-radius: 0;
+  }
+  
+  #myCarousel {
+    margin-top: 54px;
+  }
 
 }
 </style>