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

//// Reference: https://www.figma.com/file/RnLKnv09glhxGIZtn8zfmh/UI-Themes-%26-Accessibility?node-id=321%3A65847
$accent: #268075;
$alert: #D62C25;
$links: #0A6ECA;
$primary-content: #17191C;
$secondary-content: #5E6266;
$tertiary-content: $secondary-content;
$quaternary-content: $secondary-content;
$quinary-content: $secondary-content;

$username-variant1-color: #0A6ECA;
$username-variant2-color: #AC3BA8;
$username-variant3-color: #078662;
$username-variant4-color: #CC1449;
$username-variant5-color: #BE4C00;
$username-variant6-color: #1C7274;
$username-variant7-color: #5C56F5;
$username-variant8-color: #3E810A;

$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: $quaternary-content;
$theme-button-bg-color: $quinary-content;
$presence-offline: $quinary-content;
$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;
$appearance-tab-border-color: $input-darker-bg-color;
$eventbubble-reply-color: $quaternary-content;
$roomtopic-color: $secondary-content;

@define-mixin mx_DialogButton_danger {
    background-color: $accent;
}

@define-mixin mx_DialogButton_secondary {
    // flip colours for the secondary ones
    font-weight: 600;
    border: 1px solid $accent !important;
    color: $accent;
    background-color: $button-secondary-bg-color;
}

@define-mixin mx_Dialog_link {
    color: $accent;
    text-decoration: none;
}

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

// Add padding (and remove margin to compensate), so the outline is not
// chopped off on the left
.mx_TabbedView_tabPanel {
    margin-left: 236px !important;  // Remove 4 to allow 4 in mx_SettingsTab
}
.mx_SettingsTab {
    padding-left: 4px !important;
}
.mx_BaseCard {
    padding-left: 4px !important;  // Remove 4 to allow 4 in mx_BaseCard_Group
}
.mx_BaseCard_Group {
    padding-left: 4px !important;
}

.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_FontScalingPanel_fontSlider {
    background-color: $panel-actions !important;
}

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

.mx_ThemeChoicePanel > .mx_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;
}