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

/*
Copyright 2019 New Vector Ltd
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_EditMessageComposer {

    padding: 3px;
    // this is to try not make the text move but still have some
    // padding around and in the editor.
    // Actual values from fiddling around in inspector
    margin: -7px -10px -5px -10px;
    overflow: visible !important;   // override mx_EventTile_content

    .mx_BasicMessageComposer_input {
        border-radius: 4px;
        border: solid 1px $primary-hairline-color;
        background-color: $background;
        max-height: 200px;
        padding: 3px 6px;

        &:focus {
            border-color: rgba($accent, 0.5); // Only ever used here
        }
    }

    .mx_EditMessageComposer_buttons {
        display: flex;
        flex-direction: row;
        justify-content: flex-end;
        padding: 5px;
        position: absolute;
        left: 0;
        background: $header-panel-bg-color;
        z-index: 100;
        right: 0;
        margin: 0 -110px 0 0;
        padding-right: 147px;

        .mx_AccessibleButton {
            margin-left: 5px;
            padding: 5px 40px;
        }
    }
}

.mx_EventTile_last .mx_EditMessageComposer_buttons {
    position: static;
    margin-right: -147px;
}