$Name = mysqli_real_escape_string($conn, $_POST['Name']);
$Pass = mysqli_real_escape_string($conn, $_POST['Pass']);
$PassMD5 = md5($Pass);

$result1 = "SELECT * FROM users WHERE username = '$Name' && userpass = '$PassMD5' LIMIT 1";
$result2 = mysqli_query($conn, $result1);
$result3 = mysqli_fetch_assoc($result2);

if(isset($result3)){
    echo "SUCCESS";
}else{
    echo "FAIL";
}

// Converta o nome de usuário em minúsculas
$username = strtolower($Name);

// Use LOWER () para converter o nome de usuário em minúsculas
$result1 = "SELECT * FROM users WHERE LOWER(username)='$username' && userpass = '$PassMD5' LIMIT 1";

$result1 = "SELECT * FROM users WHERE UPPER(username) = UPPER('$Name') && userpass = '$PassMD5' LIMIT 1";