Answers for "border line html"

dashed lin in css

hr {
  border:none;
  border-top:1px dashed #f00;
  color:#fff;
  background-color:#fff;
  height:1px;
  width:50%;
}

border in html

The CSS border property defines a border around an HTML element.
Use of CSS border property: 
p {
  border: 2px solid powderblue;
}