html {
    font-size: 62.5%;
    -webkit-text-size-adjust: 100%;
}

header {
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

main {
    font-family: -apple-system,BlinkMacSystemFont,avenir next,avenir,segoe ui,helvetica neue,helvetica,Cantarell,Ubuntu,
                roboto,noto,arial,sans-serif;
    font-size: 1.8em;
    font-weight: 400;
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6, header p {
    margin-top: 0;
    font-weight: 300; }
h1 { text-align: center; font-size: 4.0rem; line-height: 1.2; font-weight: 500; }
h2 { font-size: 3.6rem; line-height: 1.25; }
h3 { font-size: 3.0rem; line-height: 1.3; font-weight: 500; }
h4 { font-size: 2.4rem; line-height: 1.35; }
h5, header p { font-size: 1.8rem; line-height: 1.5; }
h6 { font-size: 1.5rem; line-height: 1.6; }

img {
    max-width: 100%;
}