element-web-Github/res/css/views/rooms/_PinnedEventTile.scss

/*
Copyright 2017 Travis Ralston

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

.mx_PinnedEventTile {
    min-height: 40px;
    width: 100%;
    padding: 0 4px 12px;

    display: grid;
    grid-template-areas:
        "avatar name remove"
        "content content content"
        "footer footer footer";
    grid-template-rows: max-content auto max-content;
    grid-template-columns: 24px auto 24px;
    grid-row-gap: 12px;
    grid-column-gap: 8px;

    & + .mx_PinnedEventTile {
        padding: 12px 4px;
        border-top: 1px solid $menu-border-color;
    }

    .mx_PinnedEventTile_senderAvatar {
        grid-area: avatar;
    }

    .mx_PinnedEventTile_sender {
        grid-area: name;
        font-weight: $font-semi-bold;
        font-size: $font-15px;
        line-height: $font-24px;
        text-overflow: ellipsis;
        overflow: hidden;
        white-space: nowrap;
    }

    .mx_PinnedEventTile_unpinButton {
        visibility: hidden;
        grid-area: remove;
        position: relative;
        width: 24px;
        height: 24px;
        border-radius: 8px;

        &:hover {
            background-color: $roomheader-addroom-bg-color;
        }

        &::before {
            content: "";
            position: absolute;
            //top: 0;
            //left: 0;
            height: inherit;
            width: inherit;
            background: $secondary-content;
            mask-position: center;
            mask-size: 8px;
            mask-repeat: no-repeat;
            mask-image: url('$(res)/img/image-view/close.svg');
        }
    }

    .mx_PinnedEventTile_message {
        grid-area: content;
    }

    .mx_PinnedEventTile_footer {
        grid-area: footer;
        font-size: 10px;
        line-height: 12px;

        .mx_PinnedEventTile_timestamp {
            font-size: inherit;
            line-height: inherit;
            color: $secondary-content;
        }

        .mx_AccessibleButton_kind_link {
            margin-left: 12px;
            font-size: inherit;
            line-height: inherit;
        }
    }

    &:hover {
        .mx_PinnedEventTile_unpinButton {
            visibility: visible;
        }
    }
}