<?php

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// SQL Query to insert CSS data.
$sql = "INSERT INTO MyRecords (css) VALUES ('".$_POST['css']."')";

// Execute SQL Query. Return either ID or error.
if ($conn->query($sql) === TRUE) {
    print( $conn->insert_id );
} else {
    print( "Error: " . $sql . "<br>" . $conn->error );
}

$conn->close();