* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    font-family: system-ui, sans-serif;
    background: #f5f5f5;
    color: #222;
}

main {
    text-align: center;
    padding: 2rem;
}

h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

p {
    color: #666;
}

button {
    margin-top: 1rem;
    padding: 0.7rem 1.2rem;
    border: 0;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
}