2 different widths for select menus in same form

I want to have 2 different dropdown boxes in contact form 7 with 2 different widths.
I assigned 2 classes for each dropdown: mydropdown1 and mydropdown2.
I’m using agentpress theme and this code in the theme:
.entry-content select { width: 200px;
overrides my entry at the bottom of the styles.css for the agent press theme that i entered:
.mydropdown1 { height: 20px; width: 10px;}
.mydropdown2 { height: 20px; width: 150px;}
How can fix this?

http://wordpress.org/extend/plugins/contact-form-7/