This is an example of a simple signup form designed using HTML, CSS, and Bootstrap framework 4. The form consists of input fields and a signup button. The body of the form is given a background-color of #000, whereas the signup card is given the styles of background-color as #fff, padding as 45px, and border-radius as 1px. The title of the signup card is given a font-size of 36px, and a letter-spacing of 0.08em. The input fields are given the styles of font-size as 16px, padding as 10px 15px, color as #555, background-color as #fff, and border-radius as 3px. The signup button has the styles of background as #44c5ee, padding as 10px 28px, border as 2px solid #44c5ee, color as #fff, border-radius as 50px to get the oval shape, font-weight as 700, letter-spacing as 0.08em, and transition as 0.5s all. The button changes its background color to #fff, and font color to #496174, in a hover event. Source: https://bbbootstrap.com/snippets/simple-signup-form-animation-button-39008712