You can use ready-made forms such as the one provided in this code to design your website forms. This form has a white background.
This form directs the user to change the color of the border to enter at least six characters for the password.
This beautiful form consists of two parts. Text and background colors are contrasting in these two forms. There is also a nice gradient line between the . . .
The forms in this code are dark and there is an icon next to each input. The texts in this code are also white