How to make the form smaller
Maybe you want a small compact form.
This can be done from the contact form plugin settings page.
"Click for Advanced Options"
Look in the Style section:
Adjust as needed:
"Form DIV Width:" Use to adjust the width of the contact form border (if border is enabled).
Adjust as needed.
Input Text Field Size:
Use to adjust the size of the contact form text input fields.
Input CAPTCHA Field Size:
Use to adjust the size of the contact form CAPTCHA input field.
Input Textarea Field Cols: Rows:
Use to adjust the size of the contact form message textarea.
If you also need to make the captcha image smaller...
You have to edit one of the capctha image library files:
Edit the file (assuming you use the medium setting in options)
wp-content/plugins/si-captcha-for-wordpress/captcha-secureimage/securimage_show_medium.php
Change these parameters to whatever you want. (proportionally)
$img->image_width = 175;
$img->image_height = 60;