Sometimes it's hard to tell the different between subjects of a post - for HTML the equivalent to what I'm thinking is the < HR> tag. Just a code, that generates a line like 75%-90% width of the post - it would be great to break it up - and would also be more responsive than going like;
- - - - - - - -
for however long you need it

I was thinking it to be like 1px and the same color as the border of the content??
-rolls around-