element-web/res/css/views/rooms/_MessageComposerFormatBar.scss

/*
Copyright 2019 The Matrix.org Foundation C.I.C.

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_MessageComposerFormatBar {
    display: none;
    width: calc(26px * 5);
    height: 24px;
    position: absolute;
    cursor: pointer;
    border-radius: 4px;
    background-color: $message-action-bar-bg-color;
    user-select: none;
    // equal to z-index of mx_ReplyPreview and mx_RoomView_statusArea (1000)
    // but as it appears after them in the DOM, will appear on top.
    z-index: 1000;

    &.mx_MessageComposerFormatBar_shown {
        display: block;
    }

    > * {
        white-space: nowrap;
        display: inline-block;
        position: relative;
        border: 1px solid $message-action-bar-border-color;
        margin-left: -1px;

        &:hover {
            border-color: $message-action-bar-hover-border-color;
        }

        &:first-child {
            border-radius: 3px 0 0 3px;
        }

        &:last-child {
            border-radius: 0 3px 3px 0;
        }

        &:only-child {
            border-radius: 3px;
        }
    }

    .mx_MessageComposerFormatBar_button {
        width: 27px;
        height: 24px;
        box-sizing: border-box;
    }

    .mx_MessageComposerFormatBar_button::after {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        height: 100%;
        width: 100%;
        mask-repeat: no-repeat;
        mask-position: center;
        background-color: $message-action-bar-fg-color;
    }

    .mx_MessageComposerFormatBar_buttonIconBold::after {
        mask-image: url('$(res)/img/format/bold.svg');
    }

    .mx_MessageComposerFormatBar_buttonIconItalic::after {
        mask-image: url('$(res)/img/format/italics.svg');
    }

    .mx_MessageComposerFormatBar_buttonIconStrikethrough::after {
        mask-image: url('$(res)/img/format/strikethrough.svg');
    }

    .mx_MessageComposerFormatBar_buttonIconQuote::after {
        mask-image: url('$(res)/img/format/quote.svg');
    }

    .mx_MessageComposerFormatBar_buttonIconCode::after {
        mask-image: url('$(res)/img/format/code.svg');
    }
}

.mx_MessageComposerFormatBar_buttonTooltip {
    white-space: nowrap;
    font-size: 13px;
    font-weight: 600;
    min-width: 54px;
    text-align: center;

    .mx_MessageComposerFormatBar_tooltipShortcut {
        font-size: 9px;
        opacity: 0.7;
    }
}