Answers for "w3 schools media queries"

css media queries

@media only screen and (max-width: 1200px){
    /*Tablets [601px -> 1200px]*/
}
@media only screen and (max-width: 600px){
	/*Big smartphones [426px -> 600px]*/
}
@media only screen and (max-width: 425px){
	/*Small smartphones [325px -> 425px]*/
}

media query

@media only screen and (max-width: 600px) {
  body {
    background-color: lightblue;
  }
}

media queries

@media all and (max-width: 699px) and (min-width: 520px) {
   ul li a {
    padding-left: 21px;
    background: url(../images/email.png) left center no-repeat;
  }
}

minimum width of different devices in html

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