diff --git a/web/chat/chat-thread-list-item-menu.css b/web/chat/chat-thread-list-item-menu.css
--- a/web/chat/chat-thread-list-item-menu.css
+++ b/web/chat/chat-thread-list-item-menu.css
@@ -1,6 +1,6 @@
 div.sidebar .menu > button svg {
-  font-size: 16px;
   color: var(--thread-color-read);
+  padding-right: 8px;
 }
 div.sidebar .menu {
   opacity: 0;
@@ -24,6 +24,10 @@
   align-items: center;
 }
 
+.mailIcon {
+  padding-right: 8px;
+}
+
 .menu > button:focus {
   outline: none;
 }
@@ -32,24 +36,28 @@
   display: none;
   position: absolute;
   top: calc(100% + 1px);
-  right: 0;
+  right: 11px;
   z-index: 1;
   width: max-content;
   overflow: hidden;
-  background-color: #eeeeee;
-  border-radius: 5px;
-  box-shadow: 1px 1px 5px 2px #00000022;
+  border-radius: 4px;
+
+  background-color: var(--chat-thread-list-menu-bg);
 }
 .menuContentVisible {
   display: block;
+  background-color: var(--chat-thread-list-menu-bg);
 }
 
 button.menuContent {
   border: none;
   cursor: pointer;
-  padding: 10px;
-  font-size: 16px;
+  padding: 8px;
+  font-size: var(--xs-font-12);
+  line-height: var(--line-height-text);
+  color: var(--chat-thread-list-menu-color);
+  background-color: var(--chat-thread-list-menu-bg);
 }
 button.menuContent:hover {
-  background-color: #dddddd;
+  background-color: var(--chat-thread-list-menu-bg);
 }
diff --git a/web/chat/chat-thread-list-item-menu.react.js b/web/chat/chat-thread-list-item-menu.react.js
--- a/web/chat/chat-thread-list-item-menu.react.js
+++ b/web/chat/chat-thread-list-item-menu.react.js
@@ -84,6 +84,7 @@
       </button>
       <div>
         <button className={btnCls} onClick={toggleUnreadStatus}>
+          <SWMansionIcon className={css.mailIcon} icon="mail" size={18} />
           {toggleUnreadStatusButtonText}
         </button>
       </div>
diff --git a/web/theme.css b/web/theme.css
--- a/web/theme.css
+++ b/web/theme.css
@@ -114,4 +114,6 @@
   --app-list-icon-disabled-color: var(--shades-white-80);
   --account-settings-label: var(--shades-black-60);
   --account-button-color: var(--violet-dark-100);
+  --chat-thread-list-menu-color: var(--shades-white-60);
+  --chat-thread-list-menu-bg: var(--shades-black-90);
 }