Please write some code for me that will allow users to submit a contact form and send the form data to an email address.

I would like you to assume the role of a web developer. Please write some code for me that will allow users to submit a contact form and send the form data to an email address.
Design Style: Adopt a modern minimalist style, with a dark mode or a clean white background. Use CSS Grid or Flexbox for layout.
Form field:
Name: Text input field.
E-mail: Email input field.
Topic: Dropdown selection box (containing options: partnership inquiries, technical support, feedback, other).
Message Content: Multi-line text field.
Submit button: Eye-catching color with hover effect.
Responsive: On mobile device screens, form fields should automatically transition to a single-column, full-width layout.