how to align horizontally in css code example

Example 1: css align center

//HTML
<div class="parent">
	<span>Hello World</span>
</div>

//CSS
.parent {
  display: flex;
  justify-content: center;
  align-items: center;
}

Example 2: css align items vertical center

.parent {
  display: flex;
  justify-content: center;
  align-items: center;
}

Example 3: how to align elements horizontally in css

.row {
  width: 100%;
  display: flex;
  flex-direction: row;
  justify-content: center;
}
.block {
  width: 100px;
}

Example 4: css vertical center

/*Remove comment to become a better programmer. */
/* No Flexbox */
.parent {
  position: relative;
}
.child {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}

/* With Flexbox */

.parent {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

Example 5: centering horizontally

div.center{display:block;margin:auto;width:50%;}
p.center{text-align:center;}

Example 6: how to center div

<!--center text-->
<!--padding deals with margins within the element itself-->
<!--margin deals with blank space surrounding and element-->
<!DOCTYPE html>
<html>
<head>
<style>
.center {
  margin: auto;
  width: 80%;
  border: 3px solid #73AD21;
  padding: 10px; 
  margin: 20px;
}
</style>
</head>
<body>

<h2>Center Align Elements</h2>
<p>To horizontally center a block element (like div), use margin: auto;</p>

<div class="center">
  <p><b>Note: </b>Using margin:auto will not work in IE8, unless a !DOCTYPE is declared.</p>
</div>

</body>
</html>

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