元素垂直水平居中的几种方法

HTML:

html
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<body>
  <div></div>
</body>

方法1：

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body {
  width: 100%;
  height: 100vh;
  border: 1px solid blue;
}
body div {
  height: 100px;
  width: 100px;
  background-color: red;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
}

方法2：

css
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body {
  width: 100%;
  height: 100vh;
  border: 1px solid blue;
  display: flex;
}
body div {
  height: 100px;
  width: 100px;
  background-color: red;
  margin: auto;
}

方法3：

css
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body {
  width: 100%;
  height: 100vh;
  border: 1px solid blue;
  display: flex;
  justify-content: center;
  align-items: center;
}
body div {
  height: 100px;
  width: 100px;
  background-color: red;
}

方法4：

css
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body {
  width: 100%;
  height: 100vh;
  border: 1px solid blue;
}
body div {
  height: 100px;
  width: 100px;
  background-color: red;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}