How To Change Button Size on Forms

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input.button.sqs-system-button.sqs-editable-button {
    padding-top: 5px;
    padding-bottom: 5px;
    padding-left: 5px;
    padding-right: 5px;
    font-size: 10px !important;
}

how to customize the color of the form fields when they are active. By default they turn to white

I see black color here? Can you take screenshot?

@tuanphan Thank you for your reply! Regarding the active text box, it turns from the dark gray #262626 color I selected to white. I just want it to stay the dark gray #262626 color when typing in the field. I attached a screenshot below. 

Also, do you know how to customize the small descriptor text highlighted under "Account Phone Number"? I'd like to change it to a different font and color.

Thank you again for your help!