Simple PHP script wont run without errors

Basically, display.html is the form where the user enters his First and Last name then clicks submit. When the person does that it is supposed to take them to /display.php?first_name=First?last_name=Last where it says Welcome: First Name/Last Name. I didn't include the main.css file because it is not a visual error but a programming error.

The error I get: "Notice: Undefined variable: first_name in \display.php on line 13" (Picture below)
Posted Image

display.php

<?php

	// get the data from the request

	$fist_name = $_GET['first_name'];

	$last_name = $_GET['last_name'];

?>

<html>

	<head>

		<title>Name Test</title>                                                                        

		<link rel="stylesheet" type="text/css" href="main.css"/>

	</head>

	<body>

		<h2>Welcome</h2>

		[B]<p>First Name: <?php echo $first_name; ?></p>[/B]

		<p>Last Name: <?php echo $last_name; ?></p>

	</body>

</html>

display.html

<html>

	<form action="display.php" method="get">

		<label>First Name:</label>

		<input type="text" name="first_name"><br>

		<label>Last Name:</label>

		<input type="text" name="last_name"><br>

		<label> </label>

		<input type="submit" value="Submit">

	</form>

</html>

Any help would be appreciated. I have tried the last couple hours to figure it out but not sure. I want to move ahead in my textbook but don't want to overlook errors.