WPCF7 (ContactForm7) Field areas are not clickable when I float them (ex: Date)

I want a row of 3 fields, Text area, Date, and Drop down menu.
I tried to give them all a ‘one_third’ class, set their width to 30% and float them to the left, with margin-right:2%.

The design looks great, however I noticed that when I float the fields, they become unclickable, and you can’t insert anything on the text areas . If I unchecked the float, they become clickable again. Why is that?

I tried position relative on my classes, still doesn’t work.