W3.CSS Alerts
Danger!
Red often indicates a dangerous or negative situation.
Warning!
Yellow often indicates a warning that might need attention.
Success!
Green often indicates something successful or positive.
Info!
Blue often indicates a neutral informative change or action.
Displaying Alerts
The w3-panel class is the perfect class to display alerts.
Alerts are often displayed using a strong color:
Example
<div class="w3-panel w3-red">
<h3>Danger!</h3>
<p>Red often indicates a dangerous or negative situation.</p>
</div>
Try It Yourself »
The w3-container class can also be used to display alerts:
Example
<div class="w3-container w3-red">
<h3>Danger!</h3>
<p>Red often indicates a dangerous or negative situation.</p>
</div>
Try It Yourself »
Alerts in Other Colors
Alerts are often displayed in a strong color, but any color can be used:
Danger!
Here w3-pale-red is used.
w3-pink
Warning!
Here w3-pale-yellow is used.
w3-orange
Success!
Here w3-pale-green is used.
w3-blue-grey
Closing Alerts
To close the alert box, click on the X in the upper right corner:
Danger!
Red often indicates a dangerous or negative situation.
To create the X that closes the alert, add a <span> element with class w3-button and an onclick event:
Example
<span onclick="this.parentElement.style.display='none'"
class="w3-button
w3-display-topright">×</span>
Try It Yourself »
Tip: The HTML × entity is the preferred icon for close buttons (rather than the letter "X").
Rounded Alerts
Use the w3-round classes if you want rounded corners:
Success!
Here w3-round is used.
Success!
Here w3-round-large is used.
Success!
Here w3-round-xxlarge is used.
Alert as a Card
Use a w3-card class if you want the alert to be displayed as a card:
Warning!
Yellow often indicates something that needs attention.
