body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

.container {
    max-width: 800px;
    margin: auto;
    overflow: hidden;
    padding: 0 20px;
}

main {
    padding: 20px;
    background: #fff;
    margin: 20px 0;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h1 {
    color: #333;
}

.btn {
    display: inline-block;
    background: #333;
    color: #fff;
    padding: 10px 20px;
    margin: 5px 0;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
}

.btn:hover {
    background: #555;
}