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I have checked the code you've injected to your form and I can see there is a lot of code you are using to customize each field, for example, this is a code that is setting the width to 40 px:
width : 40px;
font-size : 24px;
Although you can use this code to force all the fields to have the same size:
I would suggest you to check your code so you make sure you are not overwriting the properties you've already set with the code you injected.
To change the font size for all the drop downs you can inject this code:
This should help you to change the font size for all your drop down fields at the same time.
Hope this helps.