* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    padding: 30px;
}

h1 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 20px;
}

img {
    width: 100%;
    max-width: 500px;
    height: auto;
    margin-bottom: 20px;
    border-radius: 10px;
}

input#messageInput {
    width: 100%;
    max-width: 500px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1rem;
    margin-bottom: 10px;
}

button#sendMessageButton {
    width: 100%;
    max-width: 500px;
    padding: 10px;
    background-color: #4caf50;
    color: #fff;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
}

button#sendMessageButton:hover {
    background-color: #45a049;
}

ul#messageList {
    width: 100%;
    max-width: 500px;
    list-style-type: none;
    padding: 20px;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    min-height: 300px;
    overflow: auto;
}

ul#messageList li {
    font-size: 1rem;
    color: #333;
    margin-bottom: 10px;
    word-break: break-word;
}

ul#messageList li strong {
    color: #4caf50;
}