How to make a vertical line in HTML

Put a <div> around the markup where you want the line to appear to next, and use CSS to style it:

.verticalLine {
  border-left: thick solid #ff0000;
}

<div class="verticalLine">
  some other content
</div>

You can use the horizontal rule tag to create vertical lines.

<hr width="1" size="500" style="0 auto" />

By using minimal width and large size, horizontal rule becomes a vertical one.

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