css佈局:如何實現垂直居中?

css佈局:如何實現垂直居中?

1.利用line-height實現居中,這種方法適合純文字類的;css

圖片描述

<!-- css -->
<style>
.parents {
  height: 400px;
  line-height: 400px;
  width: 400px;
  border: 1px solid red;
  text-align: center;
}

.child {
  background-color: blue;
  color: #fff;
}
 </style>
</head>

<body>
<!-- html -->
<div class="parents">
   <span class="child">css佈局,實現垂直居中</span>
</div>
</body>

2.經過設置父容器相對定位,子級設置絕對定位,標籤經過margin實現自適應居中;html

圖片描述

<!-- css -->
<style>
.parents {
  height: 400px;
  width: 400px;
  border: 1px solid red;
  position: relative;
}

.child {
  width: 200px;
  height: 100px;
  line-height: 100px;
  text-align: center;
  color: #fff;
  background-color: blue;
  /* 四個方向設置爲0, 而後經過margin爲auto自適應居中 */
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  margin: auto;
}
 </style>
</head>

<body>
<!-- html -->
<div class="parents">
  <span class="child">css佈局,實現垂直居中</span>
</div>
</body>

3.彈性佈局flex 父級設置display: flex; 子級設置margin爲auto實現自適應居中;佈局

圖片描述

<!-- css -->
  <style>
    .parents {
      height: 400px;
      width: 400px;
      border: 1px solid red;
      display: flex;
    }

    .child {
      width: 200px;
      height: 100px;
      line-height: 100px;
      text-align: center;
      color: #333;
      background-color: yellow;
      margin: auto;
  }
 </style>
</head>

<body>
 <!-- html -->
  <div class="parents">
    <span class="child">css佈局,實現垂直居中</span>
  </div>
</body>

4. 父級設置相對定位,子級設置絕對定位,而且經過位移transform實現;flex

圖片描述

<!-- css -->
  <style>
    .parents {
      height: 400px;
      width: 400px;
      border: 1px solid red;
      position: relative;
    }

    .child {
      width: 200px;
      height: 100px;
      line-height: 100px;
      text-align: center;
      color: #fff;
      background-color: green;
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
    }
  </style>
</head>

<body>
  <!-- html -->
  <div class="parents">
    <span class="child">css佈局,實現垂直居中</span>
  </div>
</body>

5. 父級設置彈性盒子,並設置彈性盒子相關屬性;spa

圖片描述

<!-- css -->
 <style>
    .parents {
      height: 400px;
      width: 400px;
      border: 1px solid red;
      display: flex;
      justify-content: center; /* 水平 */
      align-items: center; /* 垂直 */
    }

    .child {
      width: 200px;
      height: 100px;
      color: black;
      background-color: orange;
    }
  </style>
</head>

<body>
  <!-- html -->
  <div class="parents">
    <span class="child"></span>
  </div>
</body>

6. 網格佈局,父級經過轉換成表格形式,而後子級設置行內或行內塊實現。(須要注意的是:vertical-align: middle使用的前提條件是內聯元素以及display值爲table-cell的元素)。code

圖片描述

<!-- css -->
 <style>
    .parents {
      height: 400px;
      width: 400px;
      border: 1px solid red;
      display: table-cell;
      text-align: center;
      vertical-align: middle;
    }

    .child {
      width: 200px;
      height: 100px;
      color: #fff;
      background-color: blue;
      display: inline-block; /* 子元素設置行內或行內塊 */
    }
  </style>
</head>

<body>
  <!-- html -->
  <div class="parents">
    <span class="child"></span>
  </div>
</body>
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