Add background-color to carousel.

Set a background color for the carousel example so that white text is now legible. Also fixed typo on line 97.

examples/carousel/carousel.css

@@ -38,6 +38,7 @@ body {
 /* Declare heights because of positioning of img element */
 .carousel .item {
   height: 500px;
+  background-color: #777;
 }
 .carousel-inner > .item > img {
   position: absolute;
@@ -93,7 +94,7 @@ body {
 
 @media (min-width: 768px) {
 
-  /* Remve the edge padding needed for mobile */
+  /* Remove the edge padding needed for mobile */
   .marketing {
     padding-left: 0;
     padding-right: 0;