bootstap all size screens classes code example
Example 1: bootstrap screen sizes
The Bootstrap grid system has four classes:
xs (for phones - screens less than 768px wide)
sm (for tablets - screens equal to or greater than 768px wide)
md (for small laptops - screens equal to or greater than 992px wide)
lg (for laptops and desktops - screens equal to or greater than 1200px wide)
Example 2: bootstrap content fluid 2 column
<head>
<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" />
</head>
<body>
<section id="contact">
<div class="container-fluid">
<div class="row">
<div class="col-xs-6"> map </div>
<div class="col-xs-6"> contact form </div>
</div>
</div>
</section>
</body>