Answers for "hr hight css"

make <hr> bigger in boootstrap

<hr style="height:1px;border:none;color:#333;background-color:#333;" />

which is right <hr> or <hr/> in html

<hr> <!--   it represents a horizontal line break, in HTML4.0 we use <hr>, 
            in XHTML1.0 we use <hr/>,  in HTML5(which is the current version of 
            HTML) we can use both <hr> and <hr/>    
       -->