Step 1:Create Index.php file and implement below code.
<p id="para1">Hello World!</p> <p>This paragraph is not affected by the style.</p>
Step 2: Implement CSS to change text color.
<style>
#para1 {
text-align: center;
color: red;
}
</style>
Complete Code To Change P Element Text Color By CSS Id Selector.
<!DOCTYPE html>
<html>
<head>
<title>How To Change P Element Text Color By CSS Id Selector</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<style>
body {
background: pink;
}
#para1 {
text-align: center;
color: red;
}
</style>
<body>
<br /><br />
<div class="container">
<br><br><br>
<div class="text-center">
<h1 id="color" style="color: black;">How To Change P Element Text Color By CSS Id Selector</h1>
</div>
<br>
<div class="well">
<p id="para1">Hello World!</p>
<p>This paragraph is not affected by the style.</p>
</div>
<br>
</div>
</body>
</html>