Cory Rylan

My name is . Google Developer Expert, speaker, and Software Developer at VMware Clarity Design System.

Follow @coryrylan
CSS

CSS Tips Vertical Line Rule

Cory Rylan

- 1 minute

Using CSS Flexbox, we can easily make vertical line dividers that can expand and fill the parent container. First, let's start with a basic horizontal rule between two paragraphs.

<div>
<p>some text conent</p>
<hr />
<p>some text conent</p>
</div>
Basic Horizontal Rule with HTML and CSS

To style our horizontal rule to a vertical style, we need to write some CSS for the parent div and the hr element.

div {
display: flex;
}

First, we make the div container a flex parent. This style will default the container items to flex-direction: row, which will place each item side by side.

hr {
min-height: 100%;
max-height: 100vh;
margin: 0;
}
Vertical Line Rule with HTML and CSS

Once our items are displayed horizontally, we can adjust our hr to expand vertically. Using a combination of min-height and max-height, we can fill the div. Min height of 100% will expand while the max height using 100vh will limit the hr not to grow more than the viewport height.

Check out the working demo below!

View Demo Code   
 

No spam. Short occasional updates on Web Development articles, videos, and new courses in your inbox.

Related Posts

CSS

Converting CSS Pixels to Rems

Learn how to convert CSS pixel values to rem to provide scalable typography features and improve accessibility with page zoom.

Read Article
Web Components

Simple CSS Custom Property APIs with Web Components

Learn how CSS Shorthand Properties and CSS Custom Properties can simplify Web Component theming APIs.

Read Article
Web Performance

Design System Performance with Clarity Core Web Components

Learn how to build high performance UI and Design Systems on the Web using Clarity Core.

Read Article