Seeing that you are already relying on JavaScript for your menu, you can add a class to <body> using JavaScript code based on the userAgent string:
Javascript
if (navigator.userAgent.indexOf("MSIE 10") > -1) { document.body.classList.add("ie10"); }
.. and then target Internet Explorer 10 in your CSS
CSS
.ie10 .myClass { margin-top: 1px; }
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