body {
    font-family: Arial;
    background: #f4f4f4;
    margin: 0;
}

.login-box {
    width: 300px;
    margin: 100px auto;
    background: white;
    padding: 20px;
    border-radius: 5px;
}

.login-box input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
}

.login-box button {
    width: 100%;
    padding: 10px;
}

.chat-container {
    width: 600px;
    margin: 20px auto;
    background: white;
    padding: 20px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#chat-box {
    height: 400px;
    border: 1px solid #ccc;
    overflow-y: auto;
    padding: 10px;
    margin-top: 20px;
    margin-bottom: 20px;
}

.chat-input {
    display: flex;
}

.chat-input input {
    flex: 1;
    padding: 10px;
}

.chat-input button {
    padding: 10px 20px;
}

.message-item {
    margin-bottom: 15px;
}

.chat-image {
    max-width: 200px;
    width: 100%;
    border-radius: 10px;
    margin-top: 5px;
}

img {
    max-width: 100%;
}

@media screen and (max-width: 768px) {

    body {
        margin: 0;
        padding: 0;
    }

    .chat-container {
        width: 100%;
        height: 100vh;
        margin: 0;
        padding: 10px;
        box-sizing: border-box;
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }

    #chat-box {
        height: calc(100vh - 180px);
        font-size: 14px;
    }

    .chat-input {
        flex-direction: column;
        gap: 10px;
    }

    .chat-input input,
    .chat-input button {
        width: 100%;
        box-sizing: border-box;
    }

    .login-box {
        width: 90%;
        margin: 50px auto;
    }
}

.delete-btn {

    background: red;
    color: white;

    border: none;

    padding: 5px 10px;

    border-radius: 5px;

    cursor: pointer;

    margin-left: 10px;

    font-size: 12px;
}