weird headline

it is so weird that following code in my page did show the heading text in my page but text is shown in white color. I did not modify any css about this <h2> tag. I want the text color to be originally deifined in Enigma.

Please tell me what might cause this bug and how to possibly solve it. Thanks

<h2 style=”text-align: center;”>演算法交易系統的設計與實行</h2>

The page I need help with: [log in to see the link]