responsive css viewport code example
Example 1: viewport meta tag
<meta name="viewport" content="width=device-width, initial-scale=1.0">
Example 2: meta viewport scale
<meta name="viewport" content="width=device-width, user-scalable=no">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="viewport" content="width=device-width, user-scalable=no">