How to center a button in a div

How to center a button vertically

<style>
.container {
  height: 200px;
  position: relative;
  border: 3px solid green;
}
.vertical-center {
  margin: 0;
  position: absolute;
  top: 50%;
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}
</style>
<div class="container">
  <div class="vertical-center">
    <button>Centered Button</button>
  </div>
</div>

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How to center vertically and horizontally

<style>
.container {
  height: 200px;
  position: relative;
  border: 3px solid green;
}
.center {
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}
</style>
<div class="container">
  <div class="center">
    <button>Centered Button</button>
  </div>
</div>

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You can also use Flexbox to center elements:

example

.center {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
  border: 3px solid green;
}

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related pages

Tutorials:CSS alignment

Tutorials:CSS transformation

Tutorials:CSS Flexbox