Conclusion: Lining up input fields is difficult. Also the fieldset and legends don't show up
Conclusion: Styling form overrides HTML styling of cols and rows.
Conclusion: form buttons are harder to style than self-made div buttons.
Conclusion: This range slider is strange. How do you use the HTML range slider on a form?
Conclusion: The datetime-local input type is very ugly and long.
Conclusion: this is a buggy and accidental way to fatten your form elements.
Conclusion: Styling the input field layout is a next big step.
Conclusion: styling form elements is tricky.