body {
    margin: 0;
    background: #111;
    color: #fff;
    font-family: Arial;
}

.app {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 30%;
    background: #181818;
    border-right: 1px solid #333;
    overflow-y: scroll;
    padding: 10px;
}

.chat {
    width: 70%;
    display: flex;
    flex-direction: column;
}

#messages {
    flex: 1;
    padding: 15px;
    overflow-y: scroll;
}

.msg {
    margin-bottom: 12px;
}

.msg.me {
    text-align: right;
    color: #8be88b;
}

.msg.agent {
    text-align: left;
    color: #ddd;
}

.input {
    display: flex;
    padding: 10px;
    background: #222;
}

input {
    flex: 1;
    padding: 10px;
    border: none;
    outline: none;
}

button {
    background: purple;
    color: #fff;
    margin-left: 5px;
    padding: 10px 15px;
    border: none;
    cursor: pointer;
}