Margin left only on small screens in Bootstrap -

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How can I give just 20 pixels margins on a byte to bootstrap in small screens? 

  & lt; div class = "row mleft20" & gt; & Lt; / Div & gt;   
 Will it apply margins on all screens, is this a way to do this for a small screen, so that I can remove the content from the edge of the screen. Thanks   
 
 
 Use media queries pre:  
  @ media all And (max-width: 360px) {.mleft20 {margin-left: 20px; }}   
 Some helpful links:

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