Delete mySQL table from php link not working (Blank page appears)

I've listed a list of rows from my mySQL database onto an admin page. I now simply want to add an icon beside each row giving the user the option to delete the row in question.

Here's my php delete link:

<a href="delete.php?action=delete&id='$id'"><i class="icon-circle-blank"></i></a>
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And my delete.php file looks like:

<?php

require_once 'db.php';
global $con;


    if(($_GET['action'] == 'delete') && isset($_GET['id'])) {

    $id = $_GET['id'];
    $sql = "DELETE FROM quotes WHERE id = '$id'";
    $query = mysqli_query($con, $sql);

}

header("location: http://localhost:81/logintest/home.php");

    mysqli_close($con);
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?>

From some reason when I click the link, the page just returns a blank page with no database rows being deleted. What am I overlooking?