php include file also include the style of this file

Question

i have a PHP codes in index.php like this:

<?php
$modal = @$_GET["mod"];
switch ($modal){
    default:
    include "blank.php";
    break;

    case "video":
    include "video.php";
    break;
}
?>

In my video.php i have some text:

<p> Welcome, this is video page </p>

When i am clicking:

<a href=index.php?mod=video> This is nice video </a>

I am getting the message "Welcome this is video page" until here everything is working...

The problem is when i am putting the paragraph inside in div, my paragraph is hiding...

<div style="z-index:3;position:fixed;height:100%;width:100%;background-color:black;>
    <p> Welcome, this is video page </p>
</div>

The question is: How to activate this div style ? I want to see this div style.

Answer 1

Error code demo

Error: You missed " in style

Replace this to:

<div style="z-index:3;position:fixed;height:100%;width:100%;background-color:black;>
    <p> Welcome, this is video page </p>
</div>

This:

<div style="z-index:3;position:fixed;height:100%;width:100%;background-color:black;">
   <p> Welcome, this is video page </p>
</div>

Answer 2

You're missing a " after background-color:black; :

<div style="z-index:3;position:fixed;height:100%;width:100%;background-color:black;">
    <p> Welcome, this is video page </p>
</div>

But the default will be black on a black background so be sure to change the text color.

Also as noticed by @JustOnUnderMillions :

<?php
$modal = @$_GET["mod"];
switch ($modal){

    case "video":
    include "video.php";
    break;

    default:
    include "blank.php";
    break;
}
?>

default should always be the last element of your switch.