element-web/res/css/views/dialogs/_SettingsDialog.scss

/*
Copyright 2019 New Vector Ltd.

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_SettingsDialog {
  .mx_Dialog {
    max-width: 784px; // 900px - 58px (left padding) - 58px (right padding)
    width: 80%;
    height: 80%;
    border-radius: 4px;

    .mx_TabbedView_tabLabels {
      // Force the sidebar to be always visible, letting the rest of the content scroll
      position: fixed;
    }

    .mx_TabbedView_tabPanel {
      max-width: 485px;
      margin-left: 206px; // 70px margin + 136px for the sidebar
    }

    .mx_SettingsDialog_header {
      font-size: 24px;
      display: block;
      text-align: center;
      color: $dialog-title-fg-color;
      margin-top: 16px;
      margin-bottom: 24px;
      padding: 0;
    }

    .mx_SettingsDialog_close {
      position: absolute;
      top: 16px;
      right: 25px;
    }

    .mx_SettingsDialog_closeIcon {
      width: 16px;
      height: 16px;
      display: inline-block;
    }

    .mx_SettingsDialog_closeIcon:before {
      mask: url('$(res)/img/feather-icons/cancel.svg');
      background-color: $dialog-close-fg-color;
      mask-repeat: no-repeat;
      mask-size: 16px;
      mask-position: center;
      content: '';
      position: absolute;
      top: 0;
      bottom: 0;
      left: 0;
      right: 0;
    }
  }
}