[Plugin: Verve Meta Boxes] Text input fields wider?

Finally answered my own question:
I was putting the above css into my theme’s stylesheet, which of course would not be applied in wp-admin. So I needed to create a custom wp-admin stylesheet, and use a hook to apply it to the wp-admin.

in theme’s functions.php

function my_custom_admin() {
    $css_url = get_bloginfo('stylesheet_directory') . '/my-wp-admin.css';
    ?>
    <link rel="stylesheet" href="<?php echo $css_url;?>">
    <?php
}
add_action('admin_head', 'my_custom_admin');

in themes/my-theme/my-wp-admin.css

/* Verve Meta Boxes
-------------------------------------------------------------- */
.verve_meta_box_content input[type="text"] {
	width: 300px;
}
.verve_meta_box_content input.date-pick {
	width: auto;
}