Add support for custom chat styles (#1917)

css/chat_style-cai-chat.css

@@ -0,0 +1,91 @@
+.chat {
+    margin-left: auto;
+    margin-right: auto;
+    max-width: 800px;
+    height: calc(100vh - 306px);
+    overflow-y: auto;
+    padding-right: 20px;
+    display: flex;
+    flex-direction: column-reverse;
+    word-break: break-word;
+    overflow-wrap: anywhere;
+}
+
+.message {
+    display: grid;
+    grid-template-columns: 60px minmax(0, 1fr);
+    padding-bottom: 25px;
+    font-size: 15px;
+    font-family: Helvetica, Arial, sans-serif;
+    line-height: 1.428571429;
+}
+
+.circle-you {
+    width: 50px;
+    height: 50px;
+    background-color: rgb(238, 78, 59);
+    border-radius: 50%;
+}
+
+.circle-bot {
+    width: 50px;
+    height: 50px;
+    background-color: rgb(59, 78, 244);
+    border-radius: 50%;
+}
+
+.circle-bot img,
+.circle-you img {
+    border-radius: 50%;
+    width: 100%;
+    height: 100%;
+    object-fit: cover;
+}
+
+.text {}
+
+.text p {
+    margin-top: 5px;
+}
+
+.username {
+    font-weight: bold;
+}
+
+.message-body {}
+
+.message-body img {
+    max-width: 300px;
+    max-height: 300px;
+    border-radius: 20px;
+}
+
+.message-body p {
+    margin-bottom: 0 !important;
+    font-size: 15px !important;
+    line-height: 1.428571429 !important;
+}
+
+.message-body li {
+    margin-top: 0.5em !important;
+    margin-bottom: 0.5em !important;
+}
+
+.message-body li > p {
+    display: inline !important;
+}
+
+.message-body code {
+    overflow-x: auto;
+}
+.message-body :not(pre) > code {
+    white-space: normal !important;
+}
+
+.dark .message-body p em {
+    color: rgb(138, 138, 138) !important;
+}
+
+.message-body p em {
+    color: rgb(110, 110, 110) !important;
+}