* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, sans-serif;
    line-height: 1.6;
}

header,
main {
    max-width: 900px;
    margin: auto;
    padding: 2rem;
}

h1,
h2 {
    line-height: 1.2;
}