body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    text-align: center;
}

.login-container, .upload-container {
    width: 300px;
    margin: 100px auto;
    background: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

input, button {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 3px;
}

button {
    background: #28a745;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #218838;
}

.error {
    color: red;
}

.success {
    color: green;
}

.logout-btn {
    display: inline-block;
    margin-top: 10px;
    color: red;
    text-decoration: none;
}