I have placed the IE portion in <head> area as you explained, untouched
Code:
<!--[if IE]>
<style type="text/css">
button { margin-left: 0px; margin-right: 0px; padding-left: 0px; padding-right: 0px; }
</style>
<![endif]-->
Code:
<button value="submit" class="submitBtn"><span>View Plans</span></button></a>