Update solution.md

Remove extra "b" from "visible".

Author: paroche

2-ui/2-events/01-introduction-browser-events/07-carousel/solution.md

@@ -1,6 +1,6 @@
 The images ribbon can be represented as `ul/li` list of images `<img>`.
 
-Normally, such a ribbon is wide, but we put a fixed-size `<div>` around to "cut" it, so that only a part of the ribbon is visibble:
+Normally, such a ribbon is wide, but we put a fixed-size `<div>` around to "cut" it, so that only a part of the ribbon is visible:
 
 ![](carousel1.svg)