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diff --git a/comm/mail/themes/shared/mail/inContentDialog.css b/comm/mail/themes/shared/mail/inContentDialog.css
new file mode 100644
index 0000000000..de2dd459aa
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+++ b/comm/mail/themes/shared/mail/inContentDialog.css
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at http://mozilla.org/MPL/2.0/. */
+
+ @import url("chrome://messenger/skin/colors.css");
+
+dialog {
+  --dialog-text-color: var(--arrowpanel-color);
+  --dialog-background-color: var(--arrowpanel-background);
+  --dialog-box-text-color: #181920;
+  --dialog-box-background-color: #fff;
+  --dialog-box-border-color: rgba(0, 0, 0, 0.3);
+  --dialog-box-border-hover-color: rgba(128, 128, 128, 0.8);
+  --dialog-button-text-color-hover: currentColor;
+  --dialog-button-background-color: color-mix(in srgb, currentColor 13%, transparent);
+  --dialog-button-background-color-hover: color-mix(in srgb, currentColor 17%, transparent);
+  --dialog-button-background-color-active: color-mix(in srgb, currentColor 30%, transparent);
+  --dialog-highlight-color: var(--in-content-primary-button-background, var(--selected-item-color));
+  --dialog-highlight-text-color: var(--in-content-primary-button-text-color, var(--selected-item-text-color));
+  --dialog-primary-background-hover: color-mix(in srgb, var(--dialog-highlight-color) 85%, black);
+  --dialog-primary-background-active: color-mix(in srgb, var(--dialog-highlight-color) 78%, black);
+}
+
+@media (prefers-color-scheme: dark) {
+  dialog {
+    --dialog-text-color: rgb(251, 251, 254);
+    --dialog-background-color: #2a2a2e;
+    --dialog-box-text-color: #f9f9fa;
+    --dialog-box-background-color: #353537;
+    --dialog-box-border-color: hsla(0, 0%, 70%, 0.4);
+    --dialog-box-border-hover-color: hsla(0, 0%, 70%, 0.5);
+    --dialog-highlight-color: #45a1ff;
+    --dialog-highlight-text-color: rgb(43, 42, 51);
+  }
+}
+
+@media (prefers-contrast) {
+  dialog {
+    --dialog-box-text-color: color-mix(in srgb, currentColor 41%, transparent);
+    --dialog-box-background-color: color-mix(in srgb, currentColor 41%, transparent);
+    --dialog-box-border-color: -moz-DialogText;
+    --dialog-box-border-hover-color: SelectedItemText;
+    --dialog-button-text-color-hover: SelectedItemText;
+    --dialog-button-background-color-hover: SelectedItem;
+    --dialog-button-background-color-active: SelectedItem;
+    border-color: WindowText !important;
+  }
+}
+
+/* Global overrides */
+
+dialog *[hidden] {
+  display: none !important;
+}
+
+.reset-list {
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+/* General UI */
+
+dialog {
+  border: 1px solid transparent;
+  border-radius: var(--arrowpanel-border-radius);
+  background-color: var(--dialog-background-color);
+  color: var(--dialog-text-color);
+  padding: 15px;
+  box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.5);
+}
+
+dialog::backdrop {
+  background: rgba(0, 0, 0, 0.5);
+}
+
+dialog :focus-visible {
+  outline: var(--focus-outline);
+  outline-offset: 1px;
+}
+
+.dialog-title {
+  display: flex;
+  align-items: center;
+  margin-block: 0 15px;
+  margin-inline: 15px;
+  font-size: 1.4em;
+  font-weight: 500;
+}
+
+.dialog-container {
+  display: flex;
+  align-items: center;
+  margin-bottom: 12px;
+}
+
+.dialog-container.vertical {
+  flex-direction: column;
+  align-items: stretch;
+}
+
+.dialog-header-image {
+  -moz-context-properties: fill, stroke;
+  fill: color-mix(in srgb, var(--dialog-highlight-color) 20%, transparent);
+  stroke: var(--dialog-highlight-color);
+  margin-inline-end: 12px;
+  height: 32px;
+}
+
+.dialog-header-image.small {
+  height: 16px;
+}
+
+.dialog-description {
+  margin-block: 0.2em;
+  line-height: 1.4em;
+}
+
+/* Warning dialog */
+
+dialog.dialog-critical {
+  box-shadow: 0 2px 20px -8px var(--red-70);
+}
+
+.warning-title {
+  display: flex;
+  align-items: center;
+  margin-top: 0;
+  background-color: var(--red-60);
+  color: var(--color-white);
+  border-radius: var(--button-border-radius);
+  padding: 6px;
+}
+
+.warning-icon {
+  fill: color-mix(in srgb, var(--color-white) 20%, transparent);
+  stroke: var(--color-white);
+}
+
+.insecure-section h3 {
+  margin-top: 0;
+}
+
+.insecure-section-description {
+  font-size: 1.05rem;
+  line-height: 1.5em;
+}
+
+.dialog-footnote {
+  margin-inline: 6px;
+  font-size: 1.05rem;
+  line-height: 1.4em;
+}
+
+/* Typography */
+
+dialog h1 {
+  margin-block-start: 0;
+  font-size: 1.17em;
+}
+
+dialog p {
+  margin-block-end: 6px;
+  font-size: 1.1em;
+  line-height: 1.4em;
+}
+
+dialog .tip-caption {
+  opacity: 0.8;
+  font-size: 1em;
+}
+
+/* Lists */
+
+dialog .radio-list {
+  margin-block: 12px;
+}
+
+dialog .radio-list li {
+  margin-block-end: 12px;
+}
+
+/* Radio button */
+
+dialog input[type="radio"] {
+  appearance: none;
+  width: 16px;
+  height: 16px;
+  padding: 0;
+  border: 1px solid var(--dialog-box-border-color);
+  border-radius: 100%;
+  margin-block: 2px;
+  margin-inline: 0 6px;
+  background-color: var(--dialog-box-background-color);
+  background-position: center;
+}
+
+dialog input[type="radio"]:enabled:hover {
+  background-color: var(--dialog-button-background-color-hover);
+}
+
+dialog input[type="radio"]:enabled:hover:active {
+  background-color: var(--dialog-button-background-color-active);
+}
+
+dialog input[type="radio"]:checked {
+  -moz-context-properties: fill;
+  fill: currentColor;
+  color: var(--dialog-highlight-text-color);
+  background-color: var(--dialog-highlight-color);
+  background-image: url("chrome://global/skin/icons/radio.svg");
+  border-color: var(--dialog-primary-background-active);
+  color-adjust: exact;
+}
+
+dialog input[type="radio"]:enabled:checked:hover {
+  background-color: var(--dialog-primary-background-hover);
+  border-color: var(--dialog-primary-background-active);
+}
+
+/* Buttons area */
+
+.vertical-buttons-container {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 3px;
+  margin-block-end: 9px;
+  padding: 0;
+}
+
+.dialog-menu-container {
+  list-style-type: none;
+  display: flex;
+  align-items: center;
+  margin-block-end: 0;
+  margin-inline: 0;
+  padding: 2px 10px;
+  justify-content: end;
+  background-color: var(--dialog-background-color);
+  position: sticky;
+  bottom: 0;
+}
+
+.dialog-menu-container.two-columns {
+  justify-content: space-between;
+}
+
+.dialog-menu-container.menu-in-body {
+  margin-inline: -10px;
+}
+
+/* Buttons */
+
+dialog .button-link {
+  appearance: none;
+  background-color: transparent !important;
+  color: LinkText;
+  border-style: none;
+  padding: 0 3px;
+  margin: 0;
+  font-weight: 600;
+  cursor: pointer;
+  min-height: auto;
+}
+
+dialog .button-link:hover {
+  text-decoration: underline;
+}
+
+dialog button:not([disabled]):hover {
+  background-color: var(--dialog-button-background-color-hover);
+  color: var(--dialog-button-text-color-hover);
+}
+
+dialog button:not([disabled]):hover:active {
+  background-color: var(--dialog-button-background-color-active);
+}
+
+dialog button.primary {
+  background-color: var(--dialog-highlight-color);
+  color: var(--dialog-highlight-text-color) !important;
+}
+
+dialog button.primary:not([disabled]):hover {
+  background-color: var(--dialog-primary-background-hover);
+}
+
+dialog button.primary:not([disabled]):hover:active {
+  background-color: var(--dialog-primary-background-active);
+}
+
+dialog button[disabled] {
+  opacity: 0.4;
+}
+
+/* Loading states */
+
+@keyframes loading-animation {
+  0% { transform: translateX(0); }
+  100% { transform: translateX(-100%); }
+}
+
+@keyframes loading-animation-rtl {
+  0% { transform: translateX(0); }
+  100% { transform: translateX(100%); }
+}
+
+span.loading-inline {
+  -moz-context-properties: fill;
+  fill: currentColor;
+  display: inline-block;
+  position: relative;
+  overflow: hidden;
+  height: 16px;
+  width: 16px;
+  color: var(--selected-item-color);
+  vertical-align: sub;
+}
+
+span.loading-inline::after {
+  position: absolute;
+  content: '';
+  background-image: url("chrome://messenger/skin/icons/loading.svg");
+  background-position: right center;
+  background-repeat: no-repeat;
+  width: 480px;
+  height: 100%;
+  animation: loading-animation 1.05s steps(30) infinite;
+}
+
+span.loading-inline:dir(rtl)::after {
+  background-position-x: left;
+  animation: loading-animation-rtl 1.05s steps(30) infinite;
+}