body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f0f0;
}

.container {
    text-align: center;
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-wrap: wrap;
}

h1 {
    color: #333;
    margin-bottom: 20px;
}

#receiveBtn {
    padding: 10px 20px;
    background: #4060B5;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
    margin-top: 1rem;
}

#receiveBtn:hover {
    background-color: #6c87d1;
}

#keyBox {
    margin-top: 20px;
    padding: 10px;
    width: 100%;
    min-width: 200px;
    border: 1px solid #ddd;
    border-radius: 4px;
}