* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    background-color: #dec;
    margin: 0;
}

#input {
    width: 100%;
}

.footer {
    background-color: #ac9;
    box-shadow: 0 0 5px #333;
    padding: 10px;
    position: fixed;
    bottom: 0;
    width: 100%;
}

.footer textarea {
    background-color: #dec;
    border: none;
    border-radius: 4px;
    padding: 4px;
}

.messages {
    padding: 10px;
}

.message {
    background-color: #efd;
    border-radius: 4px;
    font-size: 10pt;
    margin-bottom: 4px;
    padding: 8px 16px;
}

.message.system {
    color: #777;
}