Display Greetings (Morning/Evening)

helper.php

   <?php
    /* This sets the $time variable to the current hour in the 24 hour clock format */
    $time = date("H");
    /* Set the $timezone variable to become the current timezone */
    $timezone = date("e");
    /* If the time is less than 1200 hours, show good morning */
    if ($time < "12") {
        echo "Good morning";
    } else
    /* If the time is grater than or equal to 1200 hours, but less than 1700 hours, so good afternoon */
    if ($time >= "12" && $time < "17") {
        echo "Good afternoon";
    } else
    /* Should the time be between or equal to 1700 and 1900 hours, show good evening */
    if ($time >= "17" && $time < "19") {
        echo "Good evening";
    } else
    /* Finally, show good night if the time is greater than or equal to 1900 hours */
    if ($time >= "19") {
        echo "Good night";
    }
    ?>

date_default_timezone_set('America/Chicago');
//Here we define out main variables
$welcome_string="Welcome!";
$numeric_date=date("G");

//Start conditionals based on military time
if($numeric_date>=0&&$numeric_date<=11)
$welcome_string="Good Morning!";
else if($numeric_date>=12&&$numeric_date<=17)
$welcome_string="Good Afternoon!";
else if($numeric_date>=18&&$numeric_date<=23)
$welcome_string="Good Evening!";

//Display our greeting
echo "$welcome_string";

works for me but I want to add div styles to the text