Gravity forms default styles and built in classes that can be used when creating forms with this plugin Maintained from http://www.gravityhelp.com/documentation/page/Design_and_Layout Use it to style Gravity Forms like a boss :)

gravityforms.css

/****************************************************************************
 ***                            Gravity styles                            ***
 ****************************************************************************/

/*Form Body
contains the main form content*/
body .gform_wrapper .gform_body {border: 1px solid red}

/*Form List Container
unordered list used to structure all of the form elements*/
body .gform_wrapper .gform_body .gform_fields {border: 1px solid red}

/*Form List Items
individual list items containing each form element*/
body .gform_wrapper .gform_body .gform_fields .gfield {border: 1px solid red}

/*Input Field Container
wraps the actual form element inside the containing list item*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_container {border: 1px solid red}

/*Input Field Description Container
contains the field description inside the containing list item*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_description {border: 1px solid red}

/*Standard Field Label*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_label {color: red}

/*Required Field Indicator (Asterisk)*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_label .gfield_required {color: red}

/*Standard Fields*/

/*Text Field*/
body .gform_wrapper .gform_body .gform_fields .gfield input[type=text] {border: 1px solid red}

/*Drop-Down (Select) Field*/
body .gform_wrapper .gform_body .gform_fields .gfield select {border: 1px solid red}

/*Paragraph (Textarea) Field*/
body .gform_wrapper .gform_body .gform_fields .gfield textarea {border: 1px solid red}

/*Multiple-Choice (Radio) List
unordered list used to structure all of the individual list choices*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_radio {border: 1px solid red}

/*Multiple-Choice (Radio) List Items
individual list choices*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_radio li {border: 1px solid red}

/*Multiple-Choice (Radio) Inputs*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_radio li input[type=radio] {border: 1px solid red}

/*Checkbox List
unordered list used to structure all of the individual list choices*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_checkbox {border: 1px solid red}

/*Checkbox List Items
individual list choices*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_checkbox li {border: 1px solid red}

/*Checkbox Inputs*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_checkbox li input[type=checkbox] {border: 1px solid red}

/*Advanced Fields*/

/*Advanced Field (multi-field) Container
wraps the different fields in multi-field sections like the name fields, address fields, etc.*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_complex {border: 1px solid red}

/*Advanced Field – Left Container
contains the left-positioned inputs and sub-labels in the advanced fields*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_complex .ginput_left {border: 1px solid red}

/*Sub-Label: Advanced Field – Left Container
the sub-label beneath the left-positioned elements in the advanced fields*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_complex .ginput_left label {color: red}

/*Advanced Field – Right Container
contains the right-positioned inputs and sub-labels in the advanced fields*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_complex .ginput_right {border: 1px solid red}

/*Sub-Label: Advanced Field – Right Container
the sub-label beneath the right-positioned elements in the advanced fields*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_complex .ginput_right label {color: red}

/*Advanced Fields – Full Container
contains the full width inputs and sub-labels in the advanced fields*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_complex .ginput_full {border: 1px solid red}

/*Sub-Label: Advanced Field – Full Container
the sub-label beneath the full width elements in the advanced fields*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_complex .ginput_full label {color: red}

/*Time – Hours Container
contains the hours input field and sub-label*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_time_hour {border: 1px solid red}

/*Time – Hours Input Field*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_time_hour input {border: 1px solid red}

/*Sub-Label: Time – Hours*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_time_hour label {color: red}

/*Time – Minutes Container
contains the minutes input field and sub-label*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_time_minute {border: 1px solid red}

/*Time – Minutes Input Field*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_time_minute input {border: 1px solid red}

/*Sub-Label: Time – Minutes*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_time_minute label {color: red}

/*Time – AM/PM Container
contains the minutes input field and sub-label*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_time_ampm {border: 1px solid red}

/*Time – AM/PM Selector*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_time_ampm select {border: 1px solid red}

/*Date – Input Field (Datepicker Option)*/
body .gform_wrapper .gform_body .gform_fields .gfield .datepicker {border: 1px solid red}

/*Date – Icon Image (Datepicker Option)*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_input_datepicker_icon {border: 1px solid red}

/*Date – Month Container
contains the month input field and sub-label*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_date_month {border: 1px solid red}

/*Date – Month Input Field*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_date_month input {border: 1px solid red}

/*Sub-Label: Date – Month*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_date_month label {color: red}

/*Date – Day Container
contains the day input field and sub-label*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_date_day {border: 1px solid red}

/*Date – Day Field Input*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_date_day input {border: 1px solid red}

/*Sub-Label: Date – Day*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_date_day label {color: red}

/*Date – Year Container*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_date_year {border: 1px solid red}

/*Date – Year Input Field*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_date_year input {border: 1px solid red}

/*Sub-Label: Date – Year*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_date_year label {color: red}

/*HTML 5 Fields*/

/*Email Input Field (HTML 5 Option)*/
body .gform_wrapper .gform_body .gform_fields .gfield input[type=email] {border: 1px solid red}

/*Telephone Input Field (HTML 5 Option)*/
body .gform_wrapper .gform_body .gform_fields .gfield input[type=tel] {border: 1px solid red}

/*Website Input Field (HTML 5 Option)*/
body .gform_wrapper .gform_body .gform_fields .gfield input[type=url] {border: 1px solid red}

/*Section Breaks*/

/*Section Break Container
wraps the section break elements inside the containing list item*/
body .gform_wrapper .gform_body .gform_fields .gsection {border: 1px solid red}

/*Section Break Title*/
body .gform_wrapper .gform_body .gform_fields .gsection .gsection_title {color: red}

/*Section Break Description*/
body .gform_wrapper .gform_body .gform_fields .gsection .gsection_description {border: 1px solid red}

/*Captcha Fields*/

/*ReCaptcha Container
third party markup inserted dynamically – contains the ReCaptcha form fields*/
body .gform_wrapper .gform_body .gform_fields .gfield .recaptcha_widget_div .recaptcha_area {border: 1px solid red}

/*Captcha Container (Really Simple Captcha Option)
wraps the captcha images and form elements*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_captcha_container {border: 1px solid red}

/*Captcha Image (Really Simple Captcha Option)*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_captcha_container .gfield_captcha {border: 1px solid red}

/*Captcha Input Field (Really Simple Captcha Option)*/
body .gform_wrapper .gform_body .gform_fields .gfield .gfield_captcha_container .gfield_captcha_input_container input {border: 1px solid red}

/*Form Footer*/

/*Form Footer
contains the submit button and admin edit link*/
body .gform_wrapper .gform_footer {border: 1px solid red}

/*Submit Button*/
body .gform_wrapper .gform_footer input[type=submit] {border: 1px solid red}

/*Submit Button (image)*/
body .gform_wrapper .gform_footer input[type=image] {border: 1px solid red}

/*Form Confirmation*/

/*Inline Confirmation Message
displays on same page upon successful completion of the form*/
body #gforms_confirmation_message  {border: 1px solid red}

/*Validation Errors*/

/*Validation Error Message*/
body .gform_wrapper .validation_error {border: 1px solid red}

/*Validation – Error Container
individual list items containing inputs with invalid values*/
body .gform_wrapper .gform_body .gform_fields .gfield_error {border: 1px solid red}

/*Validation – Error Description Message
description/error message below inputs with invalid values*/
body .gform_wrapper .gform_body .gform_fields .gfield_error .validation_message {border: 1px solid red}

/*Multi-Page Form Fields*/

/*Multi-Page Form Progress Bar Container*/
body .gform_wrapper .gf_progressbar_wrapper {border: 1px solid red}

/*Multi-Page Form Progress Bar Title*/
body .gform_wrapper .gform_body .gf_progressbar_wrapper .gf_progressbar_title {color: red}

/*Multi-Page Form Progress Bar*/
body .gform_wrapper .gf_progressbar_wrapper .gf_progressbar {border: 1px solid red}

/*Multi-Page Form Progress Bar – Percentage Completed*/
body .gform_wrapper .gf_progressbar_wrapper .gf_progressbar .gf_progressbar_percentage {border: 1px solid red}

/*Multi-Page Form Steps Container
contains the user-defined steps text*/
body .gform_wrapper .gf_page_steps {border: 1px solid red}

/*Multi-Page Form Step*/
body .gform_wrapper .gf_page_steps .gf_step {color: red}

/*Multi-Page Form Active Step*/
body .gform_wrapper .gf_page_steps .gf_step_active {color: red}

/*Multi-Page Form Page
wraps each “paged” set of fields*/
body .gform_wrapper .gform_body .gform_page {border: 1px solid red}

/*Multi-Page Form Footer
contains previous and next paging buttons*/
body .gform_wrapper .gform_body .gform_page_footer {border: 1px solid red}

/*Multi-Page Form – Next Button*/
body .gform_wrapper .gform_body .gform_page_footer .gform_next_button {border: 1px solid red}

/*Multi-Page Form – Previous Button*/
body .gform_wrapper .gform_body .gform_page_footer .gform_previous_button {border: 1px solid red}

/*Multi-Page Form – Submit Button*/
body .gform_wrapper .gform_body .gform_page_footer .gform_button {border: 1px solid red}

/*List Fields – NEW for version 1.6*/

/*List Field Container
(div) wraps the list field HTML table*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_listbody .gform_wrapper .gform_body .gform_fields .gfield .ginput_list {border: 1px solid red}

/*List Field Table
list field HTML table structure that contains the list field inputs*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_listbody .gform_wrapper .gform_body .gform_fields .gfield .ginput_list table.gfield_list {border: 1px solid red}

/*List Field Table Columns
targets the individual HTML table columns (colgroups) - useful for specifying sizes or creating alternating-color column styles*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_list table.gfield_list colgroup col.gfield_list_col_odd {border: 1px solid red}

/*List Field Table Headers
targets the individual HTML table headers (labels)*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_list table.gfield_list thead thtable.gfield_list thead th {color: red}

/*List Field Table Rows
targets the individual HTML table rows - useful for specifying sizes or creating alternating-color row styles*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_list table.gfield_list tbody tr.gfield_list_row_odd {border: 1px solid red}

/*List Field Table Cells
targets the list field HTML table cells*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_list table.gfield_list tbody tr td.gfield_list_cell {border: 1px solid red}



/*List Field Icons*/
body .gform_wrapper .gform_body .gform_fields .gfield .ginput_list table.gfield_list tbody tr td.gfield_list_icons {border: 1px solid red}