W3.CSS Alerts
The w3-panel class is the perfect class to display all types of alerts:
Danger!
Red often indicates a dangerous or negative situation.
Alerts are often displayed using a strong color:
Danger!
Red often indicates a dangerous or negative situation.
Example
<div class="w3-panel w3-red">
<h3>Danger!</h3>
<p>Red often indicates a dangerous or negative situation.</p>
</div>
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Display Warnings
Warning!
Yellow often indicates a warning that might need attention.
Warning!
Yellow often indicates a warning that might need attention.
Example
<div class="w3-panel w3-yellow">
<h3>Warning!</h3>
<p>Yellow often indicates a warning that
might need attention.</p>
</div>
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Display Successs
Success!
Green often indicates something successful or positive.
Success!
Green often indicates something successful or positive.
Example
<div class="w3-panel w3-green">
<h3>Success!</h3>
<p>Green often indicates something successful
or positive.</p>
</div>
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Display Information
Info!
Blue often indicates a neutral informative change or action.
Info!
Blue often indicates a neutral informative change or action.
Example
<div class="w3-panel w3-blue">
<h3>Information!</h3>
<p>Blue often indicates a neutral
informative change or action.</p>
</div>
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Using a Container
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>
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Alerts in All Colors
Alerts are often displayed in special colors, but any color can be used:
Danger!
Red often indicates a dangerous or negative situation.
Danger!
Red often indicates a dangerous or negative situation.
Danger!
Red often indicates a dangerous or negative situation.
Danger!
Red often indicates a dangerous or negative situation.
Danger!
Red often indicates a dangerous or negative situation.
Example
<div class="w3-panel w3-blue-grey">
<h3>Danger!</h3>
<p>Red often indicates a dangerous or negative situation.</p>
</div>
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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>
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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.
