text alignment in all browsers

WordPress community- can someone help me out with this problem?

The main navigation to my site consists of text running horizontally across my page. The problem is: when I view my site on different browsers the text is not positioned the same. It either shifts to the left or to the right…

Is there anyway to make the text buttons stay in the same position?

Here is my url https://www.jessegunzel.com/blog

Here is my code:

<div id="navmenu">
<ul>
	<li><a href="<?php echo get_settings('home'); ?>">Home</a></li>
	<li><a href="?page_id=17">About</a></li>
	<li><a href="?page_id=4">Hire Me</a></li>
	<li><a href="?page_id=2">Design Portfolio</a></li>
    <li><a href="https://www.jessegunzel.com/JesseGunzel_Resume.pdf" target="_blank">Resume</a></li>
    <li><a href="?page_id=22">Contact Me</a></li>
</ul>
</div>

#navmenu {
	position:relative;
        font-size: 1.1em;
	left:248px;
        right: 15px;
	top:-23px;
	z-index:1;}

Thanks for any help with this?

Jesse