body {
    margin: 0;
    font-family: Arial, sans-serif;
    line-height: 1.5;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

section {
    margin-bottom: 6rem;
}

h1 {
    max-width: 700px;
    font-size: 3rem;
    line-height: 1.1;
}

button {
    padding: 0.8rem 1.4rem;
    font-size: 1rem;
    cursor: pointer;
}

ol {
    padding-left: 1.5rem;
}

li {
    margin-bottom: 1rem;
}