Answers for "how to set border in html"

make border to div

border: 2px solid black

how to add border in css

.div1{
	border: 10px;
    border-color: #000000;
    border-style: solid;
}

border in html

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