Thank you. I'm sorry if I'm insisting but I am afraid maybe you did not understand my ask. The plugin you shared gives us the possibility to add a box with predefined text. What we are looking for is a bit different. We want to have the possibility that for every post that we create to highlight with a box the main key takeaway. I just cannot believe that there is no such plugin available. For example, something similar to for example [blockquote align="left" author="Test"][/blockquote] but instead of the blockquote it will wrap the text around a simple box .

Do you know of any plugin or other methods to do that?

Hello,

Thank you for the video. I'm sorry if I wasnt clear. I dont want this for one time, I want that for each post I made, which includes a "Conclusion" section - that section to be inside this box. So, is there a way to reuse what you just crated but on every post? Like a shortcut formatting option, similar to [blockquote align="none" author="Mike"]My text goes here[/blockquote]

Hello,

Im afraid the instructions you provided are not sufficient for us to be able to replicate this. Can you please provide some more details? Maybe you could point us to the right section in your theme documentation which covers this in more details? 

Hello,

Is it possible to insert such a box anywhere in the post: