Answers for "small screen size css"

how to specify css for smaller screen

@media only screen and (max-width: 991px) and (min-width: 769px){
 /* CSS that should be displayed if width is equal to or less than 991px and larger 
  than 768px goes here */
}

@media only screen and (max-width: 991px){
 /* CSS that should be displayed if width is equal to or less than 991px goes here */
}

screen sizes for css media

<meta name="viewport" content="width=device-width, initial-scale=1" />