Sorry but as mentioned in my earlier post the style CSS when installed still shows the posts stacked.
It was only after trying it as found in an earlier post on this forum that I wrote to you. I have re-checked the code against the CSS of the link you had sent and found it's the same as what I pasted before.
If you check the posts on this forum you will see that another person also reported the same problem. Unfortunately, as the question has been posted inside a resolved query, it has gone unanswered. I too, posted my original question there hoping it would be the right place (my first time on a WP forum). Subsequently I posted as a new thread and received your reply.
Sorry about the long message!