This page consists of screenshots from the Contact Form Design – Form Textboxes Screen in Coming Soon Booster WordPress Plugin.
This gives an idea about how to configure the Textbox Settings for Textbox Placeholder, Font Style, Font Family, Textbox Background Color, Placeholder Alignment, Margin and Padding.
Textbox Placeholder allows you to provide content for Placeholder which you want to display on “Textbox”.
Textbox Background Color allows you to choose “Background Color” for Textbox.
Placeholder Alignment allows you to choose “Alignment” for Textbox Placeholder. You can choose “Right”, “Left” or “Center”.