利用 @media screen 实现网页布局的自适应

<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">

@media screen and (min-width:1200px){
}

@media screen and (min-width: 960px) and (max-width: 1199px) {   
}

@media screen and (min-width: 768px) and (max-width: 959px) {   
}

@media only screen and (min-width: 480px) and (max-width: 767px){  
}

@media only screen and (max-width: 479px) {   
}

@media only screen and (max-width: 300px) {
  p {
​    background-color: blue;
  }
}

@media screen and (min-width: 300px) and (max-width: 800px) {
  p {
​    background-color: red;
  }
}

@media screen and (min-width: 800px) {
  p {
​    background-color: pink;
  }
}