mstyleA2.mml

<?xml version="1.0" encoding="UTF-8"?>

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mstyle mathsize="110%" mathvariant="bold-italic" mathcolor="#5F9EA0">
    <mn>2</mn> 
    <mo>+</mo> 
    <mi>x</mi> 
  </mstyle> </math>