diff --git a/src/options/shared/dialog-styles.js b/src/options/shared/dialog-styles.js
new file mode 100644
index 0000000..8d50f1a
--- /dev/null
+++ b/src/options/shared/dialog-styles.js
@@ -0,0 +1,35 @@
+import {css} from 'lit';
+
+export const DIALOG_STYLES = css`
+  dialog {
+    padding: 0;
+    border: 1px solid rgba(0, 0, 0, 0.3);
+    border-radius: 6px;
+    box-shadow: 0 3px 7px rgba(0, 0, 0, 0.3);
+  }
+
+
+  dialog h3 {
+    margin-bottom: 10px;
+  }
+
+  dialog::backdrop {
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background-color: rgba(0, 0, 0, 0.5);
+  }
+
+  .scrollable {
+    padding: 1em;
+    overflow-y: auto;
+  }
+
+  .action_buttons {
+    border-top: 1px solid #ccc;
+    padding: 1em;
+    text-align: end;
+  }
+`;
diff --git a/src/options/shared/shared-styles.js b/src/options/shared/shared-styles.js
new file mode 100644
index 0000000..40794ec
--- /dev/null
+++ b/src/options/shared/shared-styles.js
@@ -0,0 +1,344 @@
+import {css} from 'lit';
+
+export const SHARED_STYLES = css`
+  button:not(.notbtn),
+  input,
+  select,
+  option {
+    font-size: 13px !important;
+  }
+
+  button.notbtn {
+    appearance: none;
+    background: none;
+    border: none;
+    border-radius: 0;
+    font: inherit;
+    padding: 0;
+  }
+
+  h1, h2, h3 {
+    user-select: none;
+    font-weight: normal;
+    line-height: 1;
+  }
+
+  h1 {
+    text-align: center;
+    font-size: 30px;
+  }
+
+  h2 {
+    font-size: 20px;
+    margin-bottom: 12px;
+  }
+
+  /* Copy of Chrome stylesheet (widgets.css), adapted by not applying styles
+   * for buttons with the class |nobtn|.
+   **/
+
+  /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
+   * Use of this source code is governed by a BSD-style license that can be
+   * found in https://chromium.googlesource.com/chromium/src/+/master/LICENSE */
+
+  /* This file defines styles for form controls. The order of rule blocks is
+   * important as there are some rules with equal specificity that rely on order
+   * as a tiebreaker. These are marked with OVERRIDE. */
+
+  /* Default state **************************************************************/
+
+  :-webkit-any(button:not(.notbtn),
+               input[type='button'],
+               input[type='submit']):not(.custom-appearance):not(.link-button),
+  select,
+  input[type='checkbox'],
+  input[type='radio'] {
+    -webkit-appearance: none;
+    -webkit-user-select: none;
+    background-image: -webkit-linear-gradient(#ededed, #ededed 38%, #dedede);
+    border: 1px solid rgba(0, 0, 0, 0.25);
+    border-radius: 2px;
+    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08),
+        inset 0 1px 2px rgba(255, 255, 255, 0.75);
+    color: #444;
+    font: inherit;
+    margin: 0 1px 0 0;
+    outline: none;
+    text-shadow: 0 1px 0 rgb(240, 240, 240);
+  }
+
+  :-webkit-any(button:not(.notbtn),
+               input[type='button'],
+               input[type='submit']):not(.custom-appearance):not(.link-button),
+  select {
+    min-height: 2em;
+    min-width: 4em;
+
+  }
+
+  :-webkit-any(button:not(.notbtn),
+               input[type='button'],
+               input[type='submit']):not(.custom-appearance):not(.link-button) {
+    -webkit-padding-end: 10px;
+    -webkit-padding-start: 10px;
+  }
+
+  select {
+    -webkit-appearance: none;
+    -webkit-padding-end: 20px;
+    -webkit-padding-start: 6px;
+    /* OVERRIDE */
+    background-image: -webkit-image-set(url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABMAAAAICAQAAACxSAwfAAAAUklEQVQY02P4z0AMRGZGMaShwCisyhITmb8huMzfEhOxKvuvsGAh208Ik+3ngoX/FbBbClcIUcSAw21QhXxfIIrwKAMpfNsEUYRXGVCEFc6CQwBqq4CCCtU4VgAAAABJRU5ErkJggg==') 1x, url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACcAAAAQCAQAAAA/1a6rAAAAQUlEQVR4Xu3MsQnAMBAEMI1+myf9gw0+3ASCenmu+mQn2yGn3S4Mp906DEW3CEPfzTD03QxD380w3OmIUHe9v+u9QwAt93yns5cAAAAASUVORK5CYII=') 2x),
+        -webkit-linear-gradient(#ededed, #ededed 38%, #dedede);
+    background-position: right center;
+    background-repeat: no-repeat;
+  }
+
+  html[dir='rtl'] select {
+    background-position: center left;
+  }
+
+  input[type='checkbox'] {
+
+  bottom: 2px;
+    height: 13px;
+    position: relative;
+    vertical-align: middle;
+    width: 13px;
+  }
+
+  input[type='radio'] {
+    /* OVERRIDE */
+    border-radius: 100%;
+    bottom: 1px;
+    height: 15px;
+    position: relative;
+    vertical-align: middle;
+    width: 15px;
+  }
+
+  /* TODO(estade): add more types here? */
+  input[type='number'],
+  input[type='password'],
+  input[type='search'],
+  input[type='text'],
+  input[type='url'],
+  input:not([type]),
+  textarea {
+    border: 1px solid #bfbfbf;
+    border-radius: 2px;
+    box-sizing: border-box;
+    color: #444;
+    font: inherit;
+    margin: 0;
+    /* Use min-height to accommodate addditional padding for touch as needed. */
+    min-height: 2em;
+    padding: 3px;
+    outline: none;
+  /* For better alignment between adjacent buttons and inputs. */
+    padding-bottom: 4px;
+  }
+
+  input[type='search'] {
+    -webkit-appearance: textfield;
+    /* NOTE: Keep a relatively high min-width for this so we don't obscure the end
+     * of the default text in relatively spacious languages (i.e. German). */
+    min-width: 160px;
+  }
+
+  /* Remove when https://bugs.webkit.org/show_bug.cgi?id=51499 is fixed.
+   * TODO(dbeam): are there more types that would benefit from this? */
+  input[type='search']::-webkit-textfield-decoration-container {
+    direction: inherit;
+  }
+
+  /* Checked ********************************************************************/
+
+  input[type='checkbox']:checked::before {
+    -webkit-user-select: none;
+    background-image: -webkit-image-set(url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAsAAAALCAQAAAADpb+tAAAAaElEQVR4Xl3PIQoCQQCF4Y8JW42D1bDZ4iVEjDbxFpstYhC7eIVBZHkXFGw734sv/TqDQQ8Xb1udja/I8igeIm7Aygj2IpoKTGZnVRNxAHYi4iPiDlA9xX+aNQDFySziqDN6uSp6y7ofEMwZ05uUZRkAAAAASUVORK5CYII=') 1x, url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABYAAAAWCAQAAABuvaSwAAAAvElEQVR4XrXPMUrDYBzG4UeRZnAQnFxq3XT3AsVABm8QPIHQIeAJuoqb2s1BcHAIin4HVLqEvx9NQgb5rc/wvn4mNBUbqlKDcezCp6Qexxx7lbapx/CBe6mrHsYrKXQ7hKtIre1nOD/W9eiQiK80inis680JEc+1kien+TEfzom4sJG2aZXxmG9LIqaRerohx6V2J72zl2NY2OTUgxm7MEU25sURfZg4590Zw5iFZ8mXS0ZwN+eaPjyh/8O/H7bzPJ5NOo0AAAAASUVORK5CYII=') 2x);
+    background-size: 100% 100%;
+    content: '';
+    display: block;
+    height: 100%;
+    width: 100%;
+  }
+
+  input[type='radio']:checked::before {
+    background-color: #666;
+    border-radius: 100%;
+    bottom: 3px;
+    content: '';
+    display: block;
+    left: 3px;
+    position: absolute;
+    right: 3px;
+    top: 3px;
+  }
+
+  /* Hover **********************************************************************/
+
+  :enabled:hover:-webkit-any(
+      select,
+      input[type='checkbox'],
+      input[type='radio'],
+      :-webkit-any(
+          button:not(.notbtn),
+          input[type='button'],
+          input[type='submit']):not(.custom-appearance):not(.link-button)) {
+    background-image: -webkit-linear-gradient(#f0f0f0, #f0f0f0 38%, #e0e0e0);
+    border-color: rgba(0, 0, 0, 0.3);
+    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.12),
+        inset 0 1px 2px rgba(255, 255, 255, 0.95);
+    color: black;
+  }
+
+  :enabled:hover:-webkit-any(select) {
+    /* OVERRIDE */
+    background-image: -webkit-image-set(url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABMAAAAICAQAAACxSAwfAAAAUklEQVQY02P4z0AMRGZGMaShwCisyhITmb8huMzfEhOxKvuvsGAh208Ik+3ngoX/FbBbClcIUcSAw21QhXxfIIrwKAMpfNsEUYRXGVCEFc6CQwBqq4CCCtU4VgAAAABJRU5ErkJggg==') 1x, url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACcAAAAQCAQAAAA/1a6rAAAAQUlEQVR4Xu3MsQnAMBAEMI1+myf9gw0+3ASCenmu+mQn2yGn3S4Mp906DEW3CEPfzTD03QxD380w3OmIUHe9v+u9QwAt93yns5cAAAAASUVORK5CYII=') 2x),
+        -webkit-linear-gradient(#f0f0f0, #f0f0f0 38%, #e0e0e0);
+  }
+
+  /* Active *********************************************************************/
+
+  :enabled:active:-webkit-any(
+      select,
+      input[type='checkbox'],
+      input[type='radio'],
+      :-webkit-any(
+          button:not(.notbtn),
+          input[type='button'],
+          input[type='submit']):not(.custom-appearance):not(.link-button)) {
+    background-image: -webkit-linear-gradient(#e7e7e7, #e7e7e7 38%, #d7d7d7);
+    box-shadow: none;
+    text-shadow: none;
+  }
+
+  :enabled:active:-webkit-any(select) {
+    /* OVERRIDE */
+    background-image: -webkit-image-set(url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABMAAAAICAQAAACxSAwfAAAAUklEQVQY02P4z0AMRGZGMaShwCisyhITmb8huMzfEhOxKvuvsGAh208Ik+3ngoX/FbBbClcIUcSAw21QhXxfIIrwKAMpfNsEUYRXGVCEFc6CQwBqq4CCCtU4VgAAAABJRU5ErkJggg==') 1x, url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACcAAAAQCAQAAAA/1a6rAAAAQUlEQVR4Xu3MsQnAMBAEMI1+myf9gw0+3ASCenmu+mQn2yGn3S4Mp906DEW3CEPfzTD03QxD380w3OmIUHe9v+u9QwAt93yns5cAAAAASUVORK5CYII=') 2x),
+        -webkit-linear-gradient(#e7e7e7, #e7e7e7 38%, #d7d7d7);
+  }
+
+  /* Disabled *******************************************************************/
+
+  :disabled:-webkit-any(
+      button:not(.notbtn),
+      input[type='button'],
+      input[type='submit']):not(.custom-appearance):not(.link-button),
+  select:disabled {
+    background-image: -webkit-linear-gradient(#f1f1f1, #f1f1f1 38%, #e6e6e6);
+    border-color: rgba(80, 80, 80, 0.2);
+    box-shadow: 0 1px 0 rgba(80, 80, 80, 0.08),
+        inset 0 1px 2px rgba(255, 255, 255, 0.75);
+    color: #aaa;
+  }
+
+  select:disabled {
+    /* OVERRIDE */
+    background-image: -webkit-image-set(url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABMAAAAICAQAAACxSAwfAAAASklEQVQY02P4z0AMRGZGMaShwCisyhITG/4jw8RErMr+KyxYiFC0YOF/BeyWIikEKWLA4Ta4QogiPMpACt82QRThVQYUYYWz4BAAGr6Ii6kEPacAAAAASUVORK5CYII=') 1x, url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACYAAAAQCAQAAADQF8WVAAAARElEQVR4Xu3MsQ0AIAwEsYx+m4fySsgLOuTe1Re9z4De4DzbdVDnmZ0ENcrsZJVkdoIKMzurMLOzSjNhlWfCapBlfpZbeMFeGdxKIEQAAAAASUVORK5CYII=') 2x),
+        -webkit-linear-gradient(#f1f1f1, #f1f1f1 38%, #e6e6e6);
+  }
+
+  input:disabled:-webkit-any([type='checkbox'],
+                             [type='radio']) {
+    opacity: .75;
+  }
+
+  input:disabled:-webkit-any([type='password'],
+                             [type='search'],
+                             [type='text'],
+                             [type='url'],
+                             :not([type])) {
+    color: #999;
+  }
+
+  /* Focus **********************************************************************/
+
+  :enabled:focus:-webkit-any(
+      select,
+      input[type='checkbox'],
+      input[type='number'],
+      input[type='password'],
+      input[type='radio'],
+      input[type='search'],
+      input[type='text'],
+      input[type='url'],
+      input:not([type]),
+      :-webkit-any(
+           button:not(.notbtn),
+           input[type='button'],
+           input[type='submit']):not(.custom-appearance):not(.link-button)) {
+    /* OVERRIDE */
+    -webkit-transition: border-color 200ms;
+    /* We use border color because it follows the border radius (unlike outline).
+     * This is particularly noticeable on mac. */
+    border-color: rgb(77, 144, 254);
+    outline: none;
+  }
+
+  /* Link buttons ***************************************************************/
+
+  .link-button {
+    -webkit-box-shadow: none;
+    background: transparent none;
+    border: none;
+    color: rgb(17, 85, 204);
+    cursor: pointer;
+    /* Input elements have -webkit-small-control which can override the body font.
+     * Resolve this by using 'inherit'. */
+    font: inherit;
+    margin: 0;
+    padding: 0;
+  }
+
+  .link-button:hover {
+    text-decoration: underline;
+  }
+
+  .link-button:active {
+    color: rgb(5, 37, 119);
+    text-decoration: underline;
+  }
+
+  .link-button[disabled] {
+    color: #999;
+    cursor: default;
+    text-decoration: none;
+  }
+
+  /* Checkbox/radio helpers ******************************************************
+   *
+   * .checkbox and .radio classes wrap labels. Checkboxes and radios should use
+   * these classes with the markup structure:
+   *
+   *   <div class="checkbox">
+   *     <label>
+   *       <input type="checkbox"></input>
+   *       <span>
+   *     </label>
+   *   </div>
+   */
+
+  :-webkit-any(.checkbox, .radio) label {
+    /* Don't expand horizontally: <http://crbug.com/112091>. */
+    display: -webkit-inline-box;
+    padding-bottom: 7px;
+    padding-top: 7px;
+  }
+
+  :-webkit-any(.checkbox, .radio) label input ~ span {
+    -webkit-margin-start: 0.6em;
+    -webkit-user-select: none;
+    /* Make sure long spans wrap at the same horizontal position they start. */
+    display: block;
+  }
+
+  :-webkit-any(.checkbox, .radio) label:hover {
+    color: black;
+  }
+
+  label > input:disabled:-webkit-any([type='checkbox'], [type='radio']) ~ span {
+    color: #999;
+  }
+`;