element-web-Github/res/css/structures/_RightPanel.pcss

/*
Copyright 2024 New Vector Ltd.
Copyright 2020 The Matrix.org Foundation C.I.C.
Copyright 2015, 2016 OpenMarket Ltd

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

.mx_RightPanel {
    overflow-x: hidden;
    flex: 0 0 auto;
    position: relative;
    display: flex;
    flex-direction: column;
    border-left: 1px solid $separator;
    box-sizing: border-box;
    height: 100%;
    contain: strict;
    background-color: var(--cpd-color-bg-canvas-default);

    .mx_RoomView_MessageList {
        padding: 14px 18px; /* top and bottom is 4px smaller to balance with the padding set above */
    }
}

/** Fixme - factor this out with the main header **/

.mx_RightPanel_threadsButton::before {
    mask-image: url("$(res)/img/element-icons/room/thread.svg");
}

.mx_RightPanel_notifsButton::before {
    mask-image: url("$(res)/img/element-icons/notifications.svg");
    mask-position: center;
}

.mx_RightPanel_roomSummaryButton::before {
    mask-image: url("$(res)/img/element-icons/room/room-summary.svg");
    mask-position: center;
}

.mx_RightPanel_pinnedMessagesButton {
    &::before {
        mask-image: url("$(res)/img/element-icons/room/pin.svg");
        mask-position: center;
    }
}

.mx_RightPanel_timelineCardButton {
    &::before {
        mask-image: url("$(res)/img/element-icons/feedback.svg");
        mask-position: center;
    }
}

.mx_RightPanel .mx_MemberList,
.mx_RightPanel .mx_MemberInfo {
    order: 2;
    flex: 1 1 0;
}

.mx_RightPanel .mx_RoomView_messagePanelSpinner {
    order: 2;
    margin: auto;
}