element-web/res/themes/dark/css/_dark.scss

// unified palette
// try to use these colors when possible
$bg-color: #181b21;
$base-color: #1b1f25;
$base-text-color: #edf3ff;
$header-panel-bg-color: #22262e;
$header-panel-border-color: #000000;
$header-panel-text-primary-color: #a1b2d1;
$header-panel-text-secondary-color: #c8c8cd;
$text-primary-color: #edf3ff;
$text-secondary-color: #a1b2d1;
$search-bg-color: #181b21;
$search-placeholder-color: #61708b;
$room-highlight-color: #343a46;

// typical text (dark-on-white in light skin)
$primary-fg-color: $text-primary-color;
$primary-bg-color: $bg-color;

// used for dialog box text
$light-fg-color: $header-panel-text-secondary-color;

// used for focusing form controls
$focus-bg-color: $room-highlight-color;

$mention-user-pill-bg-color: $warning-color;
$other-user-pill-bg-color: $room-highlight-color;

// informational plinth
$info-plinth-bg-color: $header-panel-bg-color;
$info-plinth-fg-color: #888;

$preview-bar-bg-color: $header-panel-bg-color;

$tagpanel-bg-color: $base-color;

// used by AddressSelector
$selected-color: $room-highlight-color;

// selected for hoverover & selected event tiles
$event-selected-color: $search-bg-color;

// used for the hairline dividers in RoomView
$primary-hairline-color: $header-panel-border-color;

// used for the border of input text fields
$input-border-color: #e7e7e7;
$input-darker-bg-color: $search-bg-color;
$input-darker-fg-color: $search-placeholder-color;
$input-lighter-bg-color: #f2f5f8;
$input-lighter-fg-color: $input-darker-fg-color;
$input-focused-border-color: #238cf5;
$input-valid-border-color: $accent-color;

$field-focused-label-bg-color: $bg-color;

// scrollbars
$scrollbar-thumb-color: rgba(255, 255, 255, 0.2);
$scrollbar-track-color: transparent;

// context menus
$menu-border-color: $header-panel-border-color;
$menu-bg-color: $header-panel-bg-color;
$menu-box-shadow-color: $bg-color;
$menu-selected-color: $room-highlight-color;

$avatar-initial-color: #ffffff;
$avatar-bg-color: $bg-color;

$h3-color: $primary-fg-color;

$dialog-background-bg-color: $header-panel-bg-color;
$lightbox-background-bg-color: #000;

$settings-grey-fg-color: #a2a2a2;
$settings-profile-placeholder-bg-color: #e7e7e7;
$settings-profile-overlay-bg-color: #000;
$settings-profile-overlay-placeholder-bg-color: transparent;
$settings-profile-overlay-fg-color: #fff;
$settings-profile-overlay-placeholder-fg-color: #454545;
$settings-subsection-fg-color: $text-secondary-color;

$topleftmenu-color: $text-primary-color;
$roomheader-color: $text-primary-color;
$roomheader-addroom-color: $header-panel-text-primary-color;
$tagpanel-button-color: $header-panel-text-primary-color;
$roomheader-button-color: $header-panel-text-primary-color;
$groupheader-button-color: $header-panel-text-primary-color;
$rightpanel-button-color: $header-panel-text-primary-color;
$composer-button-color: $header-panel-text-primary-color;
$roomtopic-color: $text-secondary-color;
$eventtile-meta-color: $roomtopic-color;

$header-divider-color: $header-panel-text-primary-color;

$roomtile-name-color: $header-panel-text-primary-color;
$roomtile-selected-color: $text-primary-color;
$roomtile-notified-color: $text-primary-color;
$roomtile-selected-bg-color: $room-highlight-color;
$roomtile-focused-bg-color: $room-highlight-color;

$roomtile-transparent-focused-color: rgba(0, 0, 0, 0.1);

$panel-divider-color: $header-panel-border-color;

$widget-menu-bar-bg-color: $search-bg-color;

// event redaction
$event-redacted-fg-color: #606060;
$event-redacted-border-color: #000000;

// event timestamp
$event-timestamp-color: $text-secondary-color;

// Tabbed views
$tab-label-fg-color: $text-primary-color;
$tab-label-active-fg-color: $text-primary-color;
$tab-label-bg-color: transparent;
$tab-label-active-bg-color: $accent-color;
$tab-label-icon-bg-color: $text-primary-color;
$tab-label-active-icon-bg-color: $text-primary-color;

// Buttons
$button-primary-fg-color: #ffffff;
$button-primary-bg-color: $accent-color;
$button-secondary-bg-color: transparent;
$button-danger-fg-color: #ffffff;
$button-danger-bg-color: $notice-primary-color;
$button-danger-disabled-fg-color: #ffffff;
$button-danger-disabled-bg-color: #f5b6bb; // TODO: Verify color

$room-warning-bg-color: $header-panel-bg-color;

$panel-gradient: rgba(34, 38, 46, 0), rgba(34, 38, 46, 1);

/*** form elements ***/

// .mx_textinput is a container for a text input
// + some other controls like buttons, ...
// it has the appearance of a text box so the controls
// appear to be part of the input

.mx_Dialog, .mx_MatrixChat {

    :not(.mx_textinput):not(.mx_Field):not(.mx_no_textinput) > input[type=text],
    :not(.mx_textinput):not(.mx_Field):not(.mx_no_textinput) > input[type=search],
    .mx_textinput {
        background-color: transparent;
        color: $input-darker-fg-color;
        border: 1px solid #c1c1c1;
    }

    .mx_textinput {
        > input[type=text],
        > input[type=search] {
            color: $primary-fg-color;
        }
        input::placeholder {
            color: $roomsublist-label-fg-color;
        }
    }
}

/*** panels ***/
.dark-panel {
    background-color: $header-panel-bg-color;
}

.dark-panel {
    :not(.mx_textinput):not(.mx_Field):not(.mx_no_textinput) > input[type=text],
    :not(.mx_textinput):not(.mx_Field):not(.mx_no_textinput) > input[type=search],
    .mx_textinput {
        color: $input-darker-fg-color;
        background-color: $input-darker-bg-color;
        border: none;
    }
}

.light-panel {
    :not(.mx_textinput):not(.mx_Field):not(.mx_no_textinput) > input[type=text],
    :not(.mx_textinput):not(.mx_Field):not(.mx_no_textinput) > input[type=search],
    .mx_textinput {
        color: $input-lighter-fg-color;
        background-color: $input-lighter-bg-color;
        border: none;
    }
}

// ***** Mixins! *****

@define-mixin mx_DialogButton {
    /* align images in buttons (eg spinners) */
    vertical-align: middle;
    border: 0px;
    border-radius: 4px;
    font-family: $font-family;
    font-size: 14px;
    color: $button-fg-color;
    background-color: $button-bg-color;
    width: auto;
    padding: 7px;
    padding-left: 1.5em;
    padding-right: 1.5em;
    cursor: pointer;
    display: inline-block;
    outline: none;
}

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

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

// Nasty hacks to apply a filter to arbitrary monochrome artwork to make it
// better match the theme.  Typically applied to dark grey 'off' buttons or
// light grey 'on' buttons.
.mx_filterFlipColor {
    filter: invert(1);
}

.gm-scrollbar .thumb {
    filter: invert(1);
}

// markdown overrides:
.mx_EventTile_content .markdown-body pre:hover {
    border-color: #808080 !important; // inverted due to rules below
}
.mx_EventTile_content .markdown-body {
    pre, code {
        filter: invert(1);
    }

    pre code {
        filter: none;
    }

    table {
        tr {
            background-color: #000000;
        }

        tr:nth-child(2n) {
            background-color: #080808;
        }
    }
}