How to Center a Div in CSS / HTML 👆 Grid , Flex and Margin Methods

Create index.html file

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="parent1">
      <div class="child1"></div>  
    </div>
   <div class="parent2">
      <div class="child2"></div>  
    </div>
   <div class="parent3">
      <div class="child3"></div>  
    </div>
</body>
</html>

create index.css

.parent1{
  border: 1px solid red;
  height: 100px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.child1{
  width: 50px;
  height: 50px;
  background: red;
}

.parent2{
  border: 1px solid green;
  height: 100px;
  display: grid;
  place-items: center;
}
.child2{
  width: 50px;
  height: 50px;
  background: green;
}

.parent3{
  border: 1px solid blue;
  height: 100px;
}
.child3{
  margin: 25px auto;
  width: 50px;
  height: 50px;
  background: blue;
}

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