body {
    background-color: #f0f2f5;
}

.card {
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
    transition: 0.3s;
}

.card:hover {
    box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2);
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    font-family: Arial, sans-serif;
}

header {
    background-color: #f3f3f3;
    padding: 10px;
    text-align: left;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 90%;
    padding: 10px;
}

#chat-history {
    flex-grow: 1;
    overflow-y: auto;
    border: 1px solid #ccc;
    margin-bottom: 10px;
    padding: 10px;
}

#message-input {
    width: 70%;
    margin-right: 10px;
}

button {
    padding: 10px;
}