horizontal line and right way to code it in html, css

hr {
    display: block;
    height: 1px;
    border: 0;
    border-top: 1px solid #ccc;
    margin: 1em 0;
    padding: 0;
}

<div>Hello</div>
<hr/>
<div>World</div>

Here is how html5boilerplate does it:

hr {
    display: block;
    height: 1px;
    border: 0;
    border-top: 1px solid #ccc;
    margin: 1em 0;
    padding: 0;
}

I'd go for semantic markup, use an <hr/>.

Unless it's just a border what you want, then you can use a combination of padding, border and margin, to get the desired bound.

.line {
  width: 53px;
  height: 0;
  border: 1px solid #C4C4C4;
  margin: 3px;
  display:inline-block;
}

<html>
<body>
<div class="line"></div>
<div style="display:inline-block;">OR</div>
<div class="line"></div>
</body>
</html>

In HTML5, the <hr> tag defines a thematic break. In HTML 4.01, the <hr> tag represents a horizontal rule.

http://www.w3schools.com/tags/tag_hr.asp

So after definition, I would prefer <hr>

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