Template.

A template is much like a frame / a notebook / a piece of paper on which we can write words.
There are many templates to choose from, in this site.
It took many hours for me to find one which I truly liked.

At first, it didn't seem clear which original template I was using when My First Post was created three days ago, but then I discovered a template called Zen Midnight.
So now, I'm using this template as the background for all my post entries.