Equal height sections in custom Headway Theme

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We can do this without touching theme files either by using a child theme or Writing a Custom Plugin,

To include only css I’d use plugin rather than a child theme.

Example –

<?php
/*
Plugin Name: My Styles
Description: My Custom Styles for THEME-NAME 
*/
//Create a `my-style.css` in plugin folder    
add_action( 'wp_enqueue_scripts', 'wpse64258_custom_styles' );
function wpse64258_custom_styles() {
    wp_register_style( 'my-style', plugins_url('my-style.css', __FILE__) );
    wp_enqueue_style( 'my-style' );
}
?>

For CSS Code read these articles –