HTML/CSS Help w/ Validating! Unclosed Element

HTML/CSS Help w/ Validating! Unclosed Element

I am new to HTML and CSS and am trying to make it to CSS but when i use
the validaotr, it just says unclosed element!Ignore the pi
enter code here
<style>
h1{color:white;}
body{background-color:#C9C9DB;}
p{text-align:right;font-size:2em;}
p{color:#FFFFFF}
h2{color:white;font-size:1em;text-align:left;}
IMG.displayed {
display: block;
margin-left: auto;
margin-right: auto }
p1.italic {font-style:italic;}x
p1.a {list-style-type:circle;}
</style>
<p>MyTSC</p>
<IMG class="displayed" src="123.jpg" alt="Logo">
<hr width="50%" color="white"/>
<p style="font=size:2em;text-align:left;">My Fall Courses</p>
<h2>
<p1 class="a">
<li>
<p1 class="italic">COSC 4330 Computer Graphics</p1>
</br><li>
IMED 1416 Wed Design I
ITNW 2413 Networking Hardware