You need to follow a few steps to build a dismissal alert :
First, you have to add a basic alert by creating a wrapper <div> and adding a class of .alert and one of the four contextual classes.
Also add optional .alert-dismissable to the above <div> class.
Next, you have to add a close button.
Finally, use the
<button> element with the
data-dismiss = “alert” data attribute.
Example :
<div class="alert alert-success alert-dismissable">
<a href="#" class="close" data-dismiss="alert" aria-label="close">×</a>
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</div>​
