body {
    font-family: Calibri;
}

header nav ul {
    display: flex;
    gap: 2rem; /* space between items */
    list-style: none;
    padding: 0;
    margin: 0;
    justify-content: center; /* center the nav */
    align-items: center;
}

header nav li {
    display: inline; /* optional, flex handles this */
    text-decoration: none;
}

header nav li a {
    text-decoration: none;
}

main {
    max-width: 700px;
    margin: 2rem auto;
    padding: 2rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.07);
}