This is an example of another simple Contact US form, designed using HTML, CSS, and Bootstrap framework 4. The background color of the body is set as #000, to get the dark color. Media quarries have been used in the coding to the make the form mobile responsive. The information container is given a style set of max-width as 480px, width as 90%, margin as 0 auto, background-color as #ffffff, padding as 40px, border-radius as 4px, font color as #505e6c, and a box-shadow style as 1px 1px 5px rgba(0, 0, 0, 0.1). The 'Send' button is created as a primary type button with a background color of #000000, and a font color of #fff. The title of the form is displayed with a font-size of 28px, and a font-weight as bold. The input text fields have the styles of background color as #fff, box-shadow as 1px 1px 1px rgba(0, 0, 0, 0.05), and font color as inherit, where it takes a border style of 1px solid #b2b2b2, in a focus event. The 'Send' button changes its opacity value from 0.9 to 1, in a focus event. https://bbbootstrap.com/snippets/bootstrap-contact-us-form-section-47965943