How to create a vertical line with CSS
Use a div with border to quickly create vertical lines, and define styles and heights by setting border-left and height; 2. Use ::before or ::after pseudo-elements to add vertical lines without additional HTML tags, suitable for decorative separation; 3. In Flexbox layout, by setting the width and background color of the divider class, adaptive vertical dividers between elastic containers can be achieved; 4. In CSS Grid, insert vertical lines as independent columns (such as autowidth columns) into grid layout, which is suitable for responsive design; the most appropriate method should be selected according to the specific layout needs to ensure that the structure is simple and easy to maintain.
Creating a vertical line with CSS is straightforward and can be done in several ways depending on your layout needs. Here are the most common and effective methods:
1. Using a div with CSS borders
This is the simplest and most widely used method.
<div class="vertical-line"></div>
.vertical-line {
border-left: 2px solid #000; /* Creates a line on the left */
height: 100px; /* Set desired height */
margin: 0 auto; /* Centers the line if needed */
}This creates a 2px solid black vertical line, 100px tall. You can adjust
height,border-color,border-style, andborder-widthas needed.
2. Using the ::before or ::after pseudo-elements
Useful when you want to add a line without extra HTML markup.
<div class="container">Content</div>
.container {
position: relative;
padding-left: 20px; /* Make space for the line */
}
.container::before {
content: '';
position: absolute;
left: 0;
top: 0;
bottom: 0;
border-left: 1px dashed #ccc;
}This adds a dashed vertical line to the left of the container. Ideal for timeslines or sidebar dividers.
3. Using Flexbox with a divider
Great for modern layouts, especially between flex items.
<div class="flex-container"> <div>Item 1</div> <div class="divider"></div> <div>Item 2</div> </div>
.flex-container {
display: flex;
align-items: stretch;
}
.divider {
width: 1px;
background-color: #ddd;
margin: 0 10px;
}The line stretches with the tallest item due to
align-items: stretch. Adjustwidthandbackground-coloras needed.
4. Using CSS Grid
In a grid layout, you can place a line as a column.
<div class="grid-container"> <div>Left</div> <div class="v-line"></div> <div>Right</div> </div>
.grid-container {
display: grid;
grid-template-columns: 1fr auto 1fr;
gap: 10px;
}
.v-line {
background-color: #000;
width: 1px;
}This creates a clean vertical divider between two content areas in a responsive grid.
Tips:
- Use
heightormin-heightwith100%if you want the line to span the full height of a parent container (ensure the parent has a defined height). - For responsive designs, consider using
max-heightorvhunits. - Transparent borders can help with alignment without visual clutter during development.
Each method works well in different contexts—choose based on your layout system and maintenance needs.
Basically, just pick the one that fits your structure best.
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