how to make a javascript alert darker code example

Example 1: bootstrap Alerts Additional content Dismissing

  Holy guacamole! You should check in on some of those fields below.
  
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Enable dismissal of an alert via JavaScript:

$('.alert').alert()
$().alert('close')
$().alert()
$().alert('dispose')

Events

close.bs.alert
closed.bs.alert

Example 2: bootstrap Alerts Additional content

Alerts can also contain additional HTML elements like headings, paragraphs 
and dividers.


  
Well done!
  
Aww yeah, you successfully read this important alert message. This example text is going to run a bit longer so that you can see how spacing within an alert works with this kind of content.
  

  
Whenever you need to, be sure to use margin utilities to keep things nice and tidy.