Some kind of visual feedback needs to be passed to the user after they have voted successfully. At the moment the up arrow remains the same even after I have voted successfully.
Hackernews hides the up arrow after a user has upvoted successfully. The css below adds that functionality.
Modified some css to give visual feedback after upvoting
There is actually visual feedback after upvoting already :
When a story is upvoted, only the 'up' arrow will remain displayed, and the 'down' arrow will be hidden.
When a story is downvoted, it's the other way around.