This is an example of a subscription form, designed using HTML, CSS, and Bootstrap framework 4. Bootstrap and CSS styles are imported to the code with their URLs. The form is given the styles of background as #eff1f4, font color as #313437, border-radius as 3px, color as inherit, text-indent as 9px, height as 45px, margin-right as 10px, and min-width as 250px. The title of the form is given the styles of font-size as 24px, font-weight as bold, margin-bottom as 25px, and line-height as 1.5, whereas the content section has the styles of font color as #7d8285 and line-height as 1.5. The subscribe button has the styles of padding as 16px 32px, opacity as 0.9, text-transform as uppercase to automatically convert the text to uppercase, font-weight as bold, font-size as 13px, letter-spacing as 0.4px, and line-height as 1. The Subscribe button is given a background color of #055ada, and font color of #fff. The Subscribe button changes its opacity value to 1, in a hover event.