body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
}

header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1em 0;
}

main {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.container {
    margin-bottom: 20px;
    padding: 20px;
    background-color: #f9f9f9;
    border: 1px solid #ccc;
}

button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    cursor: pointer;
    margin-top: 10px;
}

button:hover {
    opacity: 0.8;
}

input[type="email"],
input[type="password"],
button[type="submit"] {
    width: 100%;
    padding: 10px;
    margin: 5px 0 10px 0;
    display: inline-block;
    border: 1px solid #ccc;
    box-sizing: border-box;
}