I'm happy you were able to learn from the seminar, cybercrime is slowly increasing in our communities. This act is mostly among the youth, and it is important to shear the disadvantages of such actions in the online community.
I see you had some difficulties in applying your markdown.
Use <div class = "text- justify"> NOT < div class = " text- justify" >
See the difference, the second which you try applying has spaces in between the characters.
Another case
Use <div class = "pull-right"> NOT < div class = " pull - right " >
Note: I told you to always make sure you close the open tag.
Use </div> Not < / div >
Always close the spaces, that reason you did not have the expected text presentation.
With time you have it well, Continue to share great life experiences on steemit.