Multiple CSS Imports
@import url('//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css');
@import url('//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.css');
@import url('//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css');
@import url('//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.css');
.row {
text-align: center;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Multiple CSS Imports</title>
<link rel="stylesheet" href="styles-01.css" />
<link rel="stylesheet" href="styles-02.css" />
</head>
<body>
<br><br>
<div class="row">
<div class="col-sm-6 col-sm-offset-3">
<!-- Standard button -->
<button type="button" class="btn btn-default">Default</button>
<!-- Provides extra visual weight and identifies the primary action in a set of buttons -->
<button type="button" class="btn btn-primary">Primary</button>
<!-- Indicates a successful or positive action -->
<button type="button" class="btn btn-success">Success</button>
<!-- Contextual button for informational alert messages -->
<button type="button" class="btn btn-info">Info</button>
<!-- Indicates caution should be taken with this action -->
<button type="button" class="btn btn-warning">Warning</button>
<!-- Indicates a dangerous or potentially negative action -->
<button type="button" class="btn btn-danger">Danger</button>
</div>
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Multiple CSS Imports</title>
<link rel="stylesheet" href="styles-01.css" />
<link rel="stylesheet" href="styles-02.css" />
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css" />
</head>
<body>
<br><br>
<div class="row">
<div class="col-sm-6 col-sm-offset-3">
<!-- Standard button -->
<button type="button" class="btn btn-default">Default</button>
<!-- Provides extra visual weight and identifies the primary action in a set of buttons -->
<button type="button" class="btn btn-primary">Primary</button>
<!-- Indicates a successful or positive action -->
<button type="button" class="btn btn-success">Success</button>
<!-- Contextual button for informational alert messages -->
<button type="button" class="btn btn-info">Info</button>
<!-- Indicates caution should be taken with this action -->
<button type="button" class="btn btn-warning">Warning</button>
<!-- Indicates a dangerous or potentially negative action -->
<button type="button" class="btn btn-danger">Danger</button>
</div>
</div>
</body>
</html>