首页 👨‍💻计算机,💂H5-css3

html5-css-媒体查询

HTML:

    <!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>响应式布局</title>
    <meta
      name="viewport"
      content="width=device-width,initial-scale=1.0,maximum-scale=1,user-scalable=no"
    />
    <meta name="format-detection" content="telephone=no,email=no" />
    <link rel="stylesheet" type="text/css" href="css/1.css" />
  </head>
  <body>
    <div>
      <header id="head">
        <ul>
          <li>header1</li>
          <li>header2</li>
          <li>header2</li>
          <li>header2</li>
          <li>header2</li>
        </ul>
        <div>icon</div>
      </header>
      <section id="main">
        <div class="left">left</div>
        <div class="center">center</div>
        <div class="right">right</div>
      </section>
      <footer id="foot">footer</footer>
    </div>
  </body>
</html>

CSS:

* {
  margin: 0px;
  padding: 0px;
  font-family: "微软雅黑";
}
#head,
#foot,
#main {
  height: 100px;
  width: 1200px;
  /*width: 85%;*/
  background-color: goldenrod;
  text-align: center;
  font-size: 48px;
  line-height: 100px;
  margin: 0 auto;
}
#head div {
  display: none;
  font-size: 20px;
  height: 30px;
  width: 100px;
  background-color: green;
  float: right;
  line-height: 30px;
  margin-top: 35px;
}
#head ul {
  width: 80%;
}
#head ul li {
  width: 20%;
  float: left;
  text-align: center;
  list-style: none;
  font-size: 20px;
}
#main {
  height: auto;
  margin: 10px auto;
  overflow: hidden;
}
.left,
.center,
.right {
  height: 600px;
  line-height: 600px;
  float: left;
  width: 20%;
  background-color: red;
}
.center {
  width: 60%;
  border-left: 10px solid #fff;
  border-right: 10px solid #fff;
  box-sizing: border-box;
}
@media only screen and (max-width: 1200px) {
  #head,
  #foot,
  #main {
    width: 100%;
  }
}
@media only screen and (max-width: 980px) {
  .right {
    display: none;
  }
  .left {
    width: 30%;
  }
  .center {
    width: 70%;
    border-right: hidden;
  }
}
@media only screen and (max-width: 640px) {
  .left,
  .center,
  .right {
    width: 100%;
    display: block;
    height: 200px;
    line-height: 200px;
  }
  .center {
    border: hidden;
    border-top: 10px solid #ffffff;
    border-bottom: 10px solid #ffffff;
    height: 600px;
    line-height: 600px;
  }
  #head ul {
    display: none;
  }
  #head div {
    display: block;
  }
}

image-20200922151311028




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