Is there a “Copy/Paste” Button Plugin?

Hello!
My will is to create a website with really small posts. Only a few characters per post. Now, I’d like to have a “Copy” button that would copy the entire post into memory …. to be pasted where you want. Searching for “Copy/Paste” plugins I only found some “Copy Protection” ones … but nothing that I’d Need!

Is there something to do to achieve this goal?

Thanks!