Added code.

client/public/style.css

@@ -0,0 +1,165 @@
+*,
+*::before,
+*::after {
+    box-sizing: border-box;
+}
+
+body {
+    font-family: sans-serif;
+    background: white;
+    margin: 0;
+    padding: 10px;
+    padding-bottom: 0;
+    font-size: 16px;
+}
+
+#chat {
+    overflow-y: scroll;
+    margin: 0;
+    display: flex;
+    flex-direction: column;
+}
+
+input {
+    background-color: gainsboro;
+    border: none;
+    height: 100%;
+    font-size: inherit;
+    flex: 1 1 auto;
+    min-width: 0;
+    box-sizing: border-box;
+}
+
+input:focus {
+    outline: none;
+    background-color: darkgray;
+}
+
+input::placeholder {
+    color: gray;
+}
+
+#userList {
+    overflow-y: scroll;
+}
+
+button,
+kbd {
+    border: none;
+    font-size: inherit;
+    border-radius: 0;
+    background-color: gainsboro;
+    color: black;
+    flex: 0 0 auto;
+}
+
+button:active {
+    background-color: darkgray;
+}
+
+.msg {
+    margin-bottom: 2px;
+    display: inline-flexbox;
+    flex-direction: row;
+    align-items: stretch;
+    justify-content: flex-start;
+    gap: 2px;
+}
+
+.msg_content {
+    word-wrap: break-word;
+    display: inline;
+}
+
+.notice {
+    background-color: wheat;
+    width: fit-content;
+    font-style: italic;
+    margin-bottom: 2px;
+}
+
+.name {
+    font-weight: bold;
+    font-style: normal;
+    flex-grow: 0;
+}
+
+.ts {
+    color: gray;
+    font-size: 0.6em;
+    margin-right: 0.5em;
+    margin-left: 0.5em;
+    font-style: normal;
+    align-self: self-end;
+}
+
+#inputContainer {
+    box-sizing: border-box;
+    padding-left: 0;
+    flex-direction: row;
+    width: 100%;
+    gap: 2px;
+    justify-content: space-evenly;
+}
+
+#bottom_group {
+    position: sticky;
+    bottom: 0px;
+    background-color: white;
+    padding-bottom: 10px;
+    margin: 0;
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+    padding-top: 2px;
+}
+
+#bottom_bar {
+    display: flex;
+    box-sizing: border-box;
+    flex-direction: row;
+    gap: 2px;
+    padding: 0;
+    width: 100%;
+    justify-content: space-between;
+    flex-wrap: wrap;
+}
+
+#name_area {
+    display: flex;
+    flex-direction: row;
+    gap: 2px;
+}
+
+#nameInput {
+    flex-grow: 0;
+    width: 10em;
+}
+
+#bottom_text {
+    padding-left: 0.5em;
+    padding-right: 0.5em;
+    background-color: gainsboro;
+    height: 100%;
+    padding-top: 2px;
+    padding-bottom: 2px;
+}
+
+.err {
+    font-weight: bold;
+    color: darkred;
+}
+
+dialog {
+    border: none;
+    background-color: white;
+    padding: 5em;
+}
+
+::backdrop {
+    backdrop-filter: blur(4px);
+}
+
+.msg.focused {
+    background-color: lightblue;
+}