element-web-Github/res/themes/light-high-contrast/css/_light-high-contrast.pcss

/* Reference: https://www.figma.com/file/RnLKnv09glhxGIZtn8zfmh/UI-Themes-%26-Accessibility?node-id=321%3A65847 */
$accent: var(--cpd-color-text-action-accent);
$alert: var(--cpd-color-text-critical-primary);
$links: var(--cpd-color-text-link-external);
$primary-content: var(--cpd-color-text-primary);
$secondary-content: var(--cpd-color-text-secondary);
$tertiary-content: var(--cpd-color-gray-800);
$quaternary-content: var(--cpd-color-gray-600);
$quinary-content: var(--cpd-color-gray-400);

$username-variant1-color: var(--cpd-color-text-decorative-1);
$username-variant2-color: var(--cpd-color-text-decorative-2);
$username-variant3-color: var(--cpd-color-text-decorative-3);
$username-variant4-color: var(--cpd-color-text-decorative-4);
$username-variant5-color: var(--cpd-color-text-decorative-5);
$username-variant6-color: var(--cpd-color-text-decorative-6);

$accent-alt: $links;
$input-border-color: $secondary-content;
$input-darker-bg-color: $quinary-content;
$input-darker-fg-color: $secondary-content;
$resend-button-divider-color: $input-darker-bg-color;
$icon-button-color: var(--cpd-color-icon-tertiary);
$theme-button-bg-color: $quinary-content;
/* not using a compound color here for now as we want to have the same color in
   light and dark theme. Until we have a non-symetrical token for it, let's keep
   it hardcoded to the following value */
$presence-offline: #e3e8f0;
$pinned-color: $tertiary-content;
$button-secondary-bg-color: $accent-fg-color;
$message-action-bar-fg-color: $primary-content;
$voice-record-stop-border-color: $quinary-content;
$voice-record-icon-color: $tertiary-content;
$roomtopic-color: $secondary-content;

/**
 * Creating a `semantic` color scale. This will not be needed with the new
 * visual language, but necessary during the transition period
 * This abstract the `green` away from where accent shades are used
 * Take: `background: rgba($accent, 0.1);`
 * would be transformed to: `background: $accent-300;`
 *
 * To use under very rare circumstances, always prefer the semantics defined
 * in https://compound.element.io/?path=/docs/tokens-semantic-colors--docs
 */
$accent-100: var(--cpd-color-green-100);
$accent-200: var(--cpd-color-green-200);
$accent-300: var(--cpd-color-green-300);
$accent-400: var(--cpd-color-green-400);
$accent-500: var(--cpd-color-green-500);
$accent-600: var(--cpd-color-green-600);
$accent-700: var(--cpd-color-green-700);
$accent-800: var(--cpd-color-green-800);
$accent-900: var(--cpd-color-green-900);
$accent-1000: var(--cpd-color-green-1000);
$accent-1100: var(--cpd-color-green-1100);
$accent-1200: var(--cpd-color-green-1200);
$accent-1300: var(--cpd-color-green-1300);
$accent-1400: var(--cpd-color-green-1400);

/* Draw an outline on buttons with focus */
.mx_AccessibleButton:focus {
    outline: 2px solid $accent;
    outline-offset: 2px;
}

.mx_BasicMessageComposer .mx_BasicMessageComposer_inputEmpty > :first-child::before {
    color: $secondary-content;
    opacity: 1 !important;
}

.mx_TextualEvent {
    color: $secondary-content;
    opacity: 1 !important;
}

.mx_Dialog,
.mx_MatrixChat_wrapper {
    :not(.mx_textinput):not(.mx_Field):not(.mx_no_textinput) > input[type="text"]::placeholder,
    :not(.mx_textinput):not(.mx_Field):not(.mx_no_textinput) > input[type="search"]::placeholder,
    .mx_textinput input::placeholder {
        color: $input-darker-fg-color !important;
    }
}

.mx_UserMenu_contextMenu .mx_UserMenu_contextMenu_header .mx_UserMenu_contextMenu_themeButton {
    background-color: $panel-actions !important;
}

.mx_ThemeChoicePanel_themeSelectors > .mx_StyledRadioButton input[type="radio"]:disabled + div {
    border-color: $primary-content;
}

.mx_ThemeChoicePanel_themeSelectors > .mx_StyledRadioButton.mx_StyledRadioButton_disabled {
    color: $primary-content;
}

.mx_RoomSearch {
    &.mx_RoomSearch_focused,
    &.mx_RoomSearch_hasQuery {
        .mx_RoomSearch_clearButton {
            &::before {
                background-color: $background !important;
            }
        }
    }
}

.mx_PollCreateDialog {
    .mx_PollCreateDialog_option {
        .mx_PollCreateDialog_removeOption {
            &::before {
                background-color: $background !important;
            }
        }
    }
}

.mx_Dialog_buttons button.mx_LocationPicker_cancelButton::before {
    background-color: $background !important;
}

.mx_SpotlightDialog_wrapper .mx_Dialog {
    #mx_SpotlightDialog_keyboardPrompt {
        kbd {
            color: $background !important;
        }
    }
}

.mx_SpotlightDialog {
    .mx_SpotlightDialog_searchBox {
        > .mx_SpotlightDialog_filter {
            color: $background !important;
            &::before {
                background-color: $background !important;
            }
        }
    }
    #mx_SpotlightDialog_content {
        .mx_SpotlightDialog_recentlyViewed {
            .mx_SpotlightDialog_option {
                &:hover,
                &[aria-selected="true"] {
                    color: $background !important;

                    .mx_DecoratedRoomAvatar_icon::before {
                        background-color: $background !important;
                    }
                }
            }
        }
        .mx_SpotlightDialog_results,
        .mx_SpotlightDialog_recentSearches,
        .mx_SpotlightDialog_otherSearches,
        .mx_SpotlightDialog_hiddenResults {
            .mx_SpotlightDialog_option {
                &:hover,
                &[aria-selected="true"] {
                    background-color: $quinary-content !important;
                    color: $background !important;

                    &.mx_SpotlightDialog_startChat::before,
                    &.mx_SpotlightDialog_joinRoomAlias::before,
                    &.mx_SpotlightDialog_explorePublicRooms::before,
                    &.mx_SpotlightDialog_startGroupChat::before {
                        background-color: $background !important;
                    }

                    .mx_DecoratedRoomAvatar_icon::before {
                        background-color: $background !important;
                    }

                    .mx_SpotlightDialog_result_publicRoomDetails {
                        .mx_SpotlightDialog_result_publicRoomHeader {
                            .mx_SpotlightDialog_result_publicRoomName {
                                color: $background;
                            }
                            .mx_SpotlightDialog_result_publicRoomAlias {
                                color: $background;
                            }
                        }
                        .mx_SpotlightDialog_result_publicRoomDescription {
                            color: $background;
                        }
                    }

                    .mx_NotificationBadge {
                        background-color: $background !important;
                    }

                    .mx_SpotlightDialog_result_details {
                        color: $background !important;
                    }
                }
            }
        }
        .mx_SpotlightDialog_enterPrompt {
            background-color: $background !important;
        }
    }
}

.mx_GenericDropdownMenu_button:hover,
.mx_GenericDropdownMenu_button[aria-expanded="true"] {
    color: $background !important;
}

.mx_ContextualMenu_wrapper.mx_GenericDropdownMenu_wrapper {
    .mx_GenericDropdownMenu_Option {
        &.mx_GenericDropdownMenu_Option--item {
            &:hover {
                background-color: $quinary-content !important;
                color: $background !important;

                &[aria-checked="true"]::before {
                    background-color: $background !important;
                }

                > .mx_GenericDropdownMenu_Option--label {
                    span:first-child {
                        color: $background !important;
                    }
                }
            }
        }
    }
}

.mx_NetworkDropdown_removeServer::before {
    background-color: $background !important;
}