Improve contrast of login form

The contrast on the login field of Tor Weather is quite bad, the text fields for typing Email ID and Password are hard to recognize.

The bad contrast is caused by the value #f8f9fa of the property background-color in the class attribute login-form. It should be changed to a color that is such that both the contrast with the white background and the black font is large enough. #7d4698, which seems to be Tor's corporate design color, seems not to be suitable because of the black font.