Sample file for theme developers include the CSS classes for v3.1 of Paid Memberships Pro elements.

blank_base.css

.pmpro_message { }
.pmpro_message.pmpro_success { }
.pmpro_message.pmpro_error { }
.pmpro_message.pmpro_alert { }
.pmpro_message a { }

.pmpro_success a { }
.pmpro_error a { }
.pmpro_alert a { }

.pmpro_captcha { }
.pmpro_captcha div { }

.pmpro_form_label-inline { }

.pmpro_form_field-checkbox .pmpro_form_label { }
.pmpro_form_field-checkbox input[type="checkbox"] { }
.pmpro_form_field-checkbox-grouped ul { }
.pmpro_form_field-checkbox-grouped li { }

.pmpro_form_field-radio-item { }
.pmpro_form_field-radio-item .pmpro_form_label { }

.pmpro_form_field-date select { }
.pmpro_form_field-date input[type="text"] { }

.pmpro_form_field-file button { }

button[type="button"]#other_discount_code_toggle,
button[type="button"]#other_discount_code_toggle:hover,
button[type="button"]#other_discount_code_toggle:focus { }

.pmpro_checkout_gateway-stripe form.pmpro_form #pmpro_payment_information_fields div#AccountNumber,
.pmpro_checkout_gateway-stripe form.pmpro_form #pmpro_payment_information_fields div#Expiry,
.pmpro_checkout_gateway-stripe form.pmpro_form #pmpro_payment_information_fields div#CVV,
.pmpro_billing_gateway-stripe form.pmpro_form #pmpro_payment_information_fields div#AccountNumber,
.pmpro_billing_gateway-stripe form.pmpro_form #pmpro_payment_information_fields div#Expiry,
.pmpro_billing_gateway-stripe form.pmpro_form #pmpro_payment_information_fields div#CVV { }

.pmpro_invoice_details .pmpro_invoice-billing-address { }

.pmpro_section { }
.pmpro_section:first-of-type { }
.pmpro_section_title { }

.pmpro_card { }
.pmpro_card_title { }
.pmpro_card_content { }
.pmpro_card_content p:not(.pmpro_form_hint) { }
.pmpro_card_content p:last-of-type { }
.pmpro_card_actions { }
.pmpro_card_content + .pmpro_card_actions { }
.pmpro_card_actions button { }
.pmpro_card_action_separator { }

.pmpro_heading-with-avatar { }

.pmpro_btn { }
.pmpro_btn:hover,
.pmpro_btn:focus { }
.pmpro_btn:active { }
.pmpro_btn-outline { }
.pmpro_btn-outline:hover,
.pmpro_btn-outline:focus { }
.pmpro_btn-delete { }
.pmpro_btn-delete:hover,
.pmpro_btn-delete:focus { }
.pmpro_btn-cancel { }
.pmpro_btn-cancel:hover,
.pmpro_btn-cancel:focus { }
.pmpro_btn-plain,
.pmpro_btn-plain:hover,
.pmpro_btn-plain:focus,
.pmpro_btn-plain:active { }
.pmpro_btn-print { }
.pmpro_btn-print:hover { }

.pmpro_form { }
.pmpro_section:has(.pmpro_form) .pmpro_card_content { }
.pmpro_section:has(.pmpro_form) .pmpro_card_title + .pmpro_card_content { }

.pmpro_form_fieldset { }
.pmpro_form_legend { }
.pmpro_form_heading { }
.pmpro_card_content .pmpro_form_heading { }

.pmpro_form_fields { }
.pmpro_form_fields-inline { }

.pmpro_form_field { }

.pmpro_form_label { }
.pmpro_form_label:not(.pmpro_form_label-inline) { }

.pmpro_form_input { }
.pmpro_form_input-textarea { }
.pmpro_form_input-text:focus,
.pmpro_form_input-email:focus,
.pmpro_form_input-url:focus,
.pmpro_form_input-password:focus,
.pmpro_form_input-search:focus,
.pmpro_form_input-select:focus,
.pmpro_form_input-checkbox:focus,
.pmpro_form_input-radio:focus,
.pmpro_form_input-multiselect:focus,
.pmpro_form_input-number:focus,
.pmpro_form_input-file:focus,
.pmpro_form_input-date:focus,
.pmpro_form_input-textarea:focus { }

.pmpro_form_hint { }

.pmpro_form_field-checkbox,
.pmpro_form_field-radio-item { }
.pmpro_form_field-checkbox .pmpro_form_hint,
.pmpro_form_field-radio-item .pmpro_form_hint { }
.pmpro_form_field-radio-item:not(:last-of-type) { }

.pmpro_form_input-multiselect { }
.pmpro_form_input-file { }

.pmpro_form_field-password-toggle { }
.pmpro_form_field-password-toggle button,
.pmpro_form_field-password-toggle button:hover,
.pmpro_form_field-password-toggle button:focus,
.pmpro_form_field-password-toggle button:active { }
.pmpro_form_field-password-toggle button:focus,
.pmpro_form_field-password-toggle button:active { }
.pmpro_form_field-password-toggle .pmpro_icon-eye { }
.pmpro_form_field-password-toggle button:focus .pmpro_icon-eye svg,
.pmpro_form_field-password-toggle button:active .pmpro_icon-eye svg { }

.pmpro_form_field-select2 { }
.pmpro_form_field-select2 .pmpro_form_label { }
.pmpro_form_field-select2 .pmpro_form_hint { }

.pmpro_payment-expiration #ExpirationMonth,
.pmpro_payment-expiration #ExpirationYear { }

.pmpro_payment-discount-code #pmpro_discount_code { }

#other_discount_code_fields { }

#pmpro_tos_fields { }
#pmpro_tos_fields #pmpro_license { }
#pmpro_tos_fields input[type="checkbox"]#tos { }

.pmpro_form_submit { }

#loginform { }

.pmpro_list_item_label { }
.pmpro_list-with-labels { }
.pmpro_list-with-labels .pmpro_list_item_label { }
.pmpro_list-with-labels .pmpro_list_item_value { }

#pmpro_account-membership-none { }
#pmpro_account-links { }

.pmpro_levels_table { }
.pmpro_level .pmpro_btn { }

.pmpro_logged_in_welcome_wrap { }

.pmpro_content_message { }

.pmpro_price_part_span { }
.pmpro_price_part-total { }

.pmpro_list { }
.pmpro_list-plain { }
.pmpro_list_item { }

.pmpro_table { }

.pmpro_tag { }
.pmpro_tag-success { }
.pmpro_tag-error { }
.pmpro_tag-alert { }

.pmpro_actions_nav { }
.pmpro_actions_nav-left { }
.pmpro_actions_nav-right { }

.pmpro_pad-s { }
.pmpro_pad-m { }
.pmpro_pad-l { }

.pmpro_spacer { }

.pmpro_clickable { }

.pmpro_asterisk abbr,
.pmpro_asterisk abbr[title] { }

.pmpro_hidden { }

.pmpro_cols-2,
.pmpro_cols-3 { }
.pmpro_cols-2 > * { }
.pmpro_cols-3 > * { }

.pmpro_font-x-large { }
.pmpro_font-large { }
.pmpro_font-medium { }
.pmpro_font-small { }

.pmpro_tag-discount-code { }

.pmpro_divider { }
.pmpro_form .pmpro_divider { }

.rtl .pmpro_form_field-password-toggle { }