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

body {
    font-family: system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue","Noto Sans","Liberation Sans",Arial,sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center; 
}

.centered-block {
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h1 {
    color: #2c3e50;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #008b07;
}

.btn {
    display: block;
    width: 200px;
    margin: 10px auto;
    padding: 0.5rem 0.75rem;
    background-color: #28a745;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    border: none;
    text-align: center;
    text-decoration: none;
    line-height: 1.5;
    cursor: pointer;
    user-select: none;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #218838;
}