Why does my javascript statement stop working once I use jquery?

This line in my js file seems to stop working if I try to change my website color from pink to purple (see webpage below):

      document.getElementById("submit").className = 'formButtonPurple';

http://www.pouyarebek.com/wdiclass/assignment4/homework4.html
shampouyaAsked:
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Sudhindra A NCommented:
you are setting the background-color property of the button in the other 2 functions to pink and blue.

Setting individual styles (or inline styles) gets preference over the css class.

If you try to update the background-color to purple it works check it.
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shampouyaAuthor Commented:
Ok these two ways seem to work now. Is there no difference between these two in terms of which one gets preference?

      $(".formButton").css("background-color", "#5959ff");
      document.getElementById("submit").style.background = "#5959ff";
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Sudhindra A NCommented:
I personally prefer using jQuery method as there will be a uniformity in coding.
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shampouyaAuthor Commented:
thanks!
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