element-web/res/themes/light-custom/css/_custom.scss

//
// --accent-color
$accent-color: var(--accent-color);
$button-bg-color: var(--accent-color);
$button-link-fg-color: var(--accent-color);
$button-primary-bg-color: var(--accent-color);
$input-valid-border-color: var(--accent-color);
$reaction-row-button-selected-border-color: var(--accent-color);
$roomsublist-chevron-color: var(--accent-color);
$tab-label-active-bg-color: var(--accent-color);
$togglesw-on-color: var(--accent-color);
$username-variant3-color: var(--accent-color);
$accent-color-50pct: var(--accent-color-50pct); //still needs alpha at .5
//
// --timeline-background-color
$authpage-body-bg-color: var(--timeline-background-color);
$button-secondary-bg-color: var(--timeline-background-color);
$field-focused-label-bg-color: var(--timeline-background-color);
$lightbox-border-color: var(--timeline-background-color);
$menu-bg-color: var(--timeline-background-color);
$avatar-bg-color: var(--timeline-background-color);
$message-action-bar-bg-color: var(--timeline-background-color);
$primary-bg-color: var(--timeline-background-color);
$roomtile-focused-bg-color: var(--timeline-background-color);
$togglesw-ball-color: var(--timeline-background-color);
$droptarget-bg-color: var(--timeline-background-color-50pct); //still needs alpha at .5
$authpage-modal-bg-color: var(--timeline-background-color-50pct); //still needs alpha at .59
//
// --roomlist-highlights-color
$roomtile-selected-bg-color: var(--roomlist-highlights-color);
//
// --sidebar-color
$interactive-tooltip-bg-color: var(--sidebar-color);
$tagpanel-bg-color: var(--sidebar-color);
$tooltip-timeline-bg-color: var(--sidebar-color);
$dialog-backdrop-color: var(--sidebar-color-50pct);
//
// --roomlist-background-color
$event-selected-color: var(--roomlist-background-color);
$header-panel-bg-color: var(--roomlist-background-color);
$reaction-row-button-bg-color: var(--roomlist-background-color);
$panel-gradient: var(--roomlist-background-color-0pct), var(--roomlist-background-color);
// these were #f2f5f8 instead of #f3f8fd, but close enough
$dark-panel-bg-color: var(--roomlist-background-color);
$input-lighter-bg-color: var(--roomlist-background-color);
$plinth-bg-color: var(--roomlist-background-color);
$roomsublist-background: var(--roomlist-background-color);
$secondary-accent-color: var(--roomlist-background-color);
$selected-color: var(--roomlist-background-color);
$widget-menu-bar-bg-color: var(--roomlist-background-color);
//
// --timeline-text-color
$message-action-bar-fg-color: var(--timeline-text-color);
$primary-fg-color: var(--timeline-text-color);
$settings-profile-overlay-placeholder-fg-color: var(--timeline-text-color);
$roomtopic-color: var(--timeline-text-color-50pct);
$tab-label-fg-color: var(--timeline-text-color);
$tab-label-icon-bg-color: var(--timeline-text-color);   //was #454545
// was #212121
$topleftmenu-color: var(--timeline-text-color);
// was #45474a
$dialog-title-fg-color: var(--timeline-text-color);
$tab-label-fg-color: var(--timeline-text-color);
// was #4e5054
$authpage-lang-color: var(--timeline-text-color);
$roomheader-color: var(--timeline-text-color);
//
// --roomlist-text-color
$roomtile-notified-color: var(--roomlist-text-color);
$roomtile-selected-color: var(--roomlist-text-color);
//
// --roomlist-text-secondary-color
$roomsublist-label-fg-color: var(--roomlist-text-secondary-color);
$roomtile-name-color: var(--roomlist-text-secondary-color);
//
// --roomlist-separator-color
$input-darker-bg-color: var(--roomlist-separator-color);
$panel-divider-color: var(--roomlist-separator-color);// originally #dee1f3, but close enough
$primary-hairline-color: var(--roomlist-separator-color);// originally #e5e5e5, but close enough
//
// --timeline-text-secondary-color
$authpage-secondary-color: var(--timeline-text-secondary-color);
$memberstatus-placeholder-color: var(--timeline-text-secondary-color);
$notice-secondary-color: var(--timeline-text-secondary-color);
$pinned-color: var(--timeline-text-secondary-color);
$settings-subsection-fg-color: var(--timeline-text-secondary-color);
$roomheader-addroom-bg-color: var(--timeline-text-secondary-color);
// was #747474
$light-fg-color: var(--timeline-text-secondary-color);
// was #777777
$blockquote-fg-color: var(--timeline-text-secondary-color);
// was #888888
$greyed-fg-color: var(--timeline-text-secondary-color);
$info-plinth-fg-color: var(--timeline-text-secondary-color);
$preview-widget-fg-color: var(--timeline-text-secondary-color);
//
// --primary-color
$accent-color-alt: var(--primary-color);
$input-focused-border-color: var(--primary-color);
//
// --warning-color
$button-danger-bg-color: var(--warning-color);
$event-highlight-fg-color: var(--warning-color);
$input-invalid-border-color: var(--warning-color);
$mention-user-pill-bg-color: var(--warning-color);
$notice-primary-color: var(--warning-color);
$pinned-unread-color: var(--warning-color);
$warning-color: var(--warning-color);
$button-danger-disabled-bg-color: var(--warning-color-50pct); // still needs alpha at 0.5