style.css

:root {
    font-family: "Arial", sans-serif;
    font-size: 12px;
    font-weight: 400;
    line-height: 1.3333;

    box-sizing: border-box;
}

*,
*::before,
*::after {
    box-sizing: inherit;
}

body {
    background: #89B8C2;

    margin: 12px;
}   

nav {
    background: #CCE9F4;

    border-radius: 8px;
    margin-bottom: 16px;
    padding-bottom: 6px;
}

.nav-caption {
    font-family: "Arial Black", sans-serif;
    font-size: 14px;
    line-height: 1.5;
    font-weight: 900;

    text-align: center;

    padding: 10px;

    display: block;
}

.nav {
    list-style: none;

    padding-left: 0; 
    margin-top: 3px;
    margin-bottom: 0;
}

.nav > li {
    text-align: center;

    padding: 0;
}

.nav > li > a {
    padding: 6px 10px;

    display: block;
}

.nav > li > a:hover {
    background: #FFFFFF;
}

a {
    color: #006EBE;
    text-decoration: none;
}

a:visited {
    color: #0B257D;
}

a:hover {
    color: #5EAAE0;
}

article {
    background: #FFFFFF;

    border-radius: 8px 8px 0 0;
    padding: 16px;
}

article header {
    line-height: 1.166666;

    background: #E9E9E9;

    border-radius: 8px;
    padding: 8px;
}

figure {
    background: #CCE9F4;

    border-radius: 10px;
    margin: 16px 0;
}

figure > img {
    display: block;
}

img {
    max-width: 100%;
    height: auto;

    border-radius: 10px 10px 0 0;
}

ol {
    list-style: none;

    margin-top: 0;
    margin-bottom: 0;
    padding-left: 0;
}

ol > li {
    border-bottom: 1px solid #89B8C2;
    padding: 10px;
}

ol > li::before {
    content: counter(list-item) ". ";
}

ol>li:last-child {
    border-bottom: 0;
}

ol > li:nth-child(odd) {
    background: #EFFAFF;
}

ol > li:nth-child(4) {
    background: #F7FFEF;
}

footer {
    line-height: 1.166666;

    background: #CCE9F4;

    border-radius: 0 0 8px 8px;
    padding: 20px;
}

.copyright,
.imprint {
    display: block;
}

.bullet {
    display: none;
}

.copyright {
    margin-bottom: 6px;
}

h1 {
    font-family: "Arial Black", sans-serif;
    font-size: 36px;
    font-weight: 900;
    line-height: 1.416666;

    margin-top: 16px;
    margin-bottom: 16px;
}

h2 {
    font-family: "Arial", sans-serif;
    font-size: 24px;
    font-weight: 700;
    line-height: 1.15;

    margin-top: 8px;
    margin-bottom: 8px;
}

p {
    margin-top: 8px;
    margin-bottom: 8px;
}

p + h2 {
    margin-top: 16px;
}

figcaption {
    font-family: "Georgia", serif;
    font-size: 12px;
    font-style: italic;
    font-weight: 400;
    line-height: 1.75;
    text-align: center;

    padding: 10px;
}

@media screen and (min-width: 620px) {
    :root {
        font-size: 14px;
        line-height: 1.5;
    }

    body {
        margin: 24px 24px 30px;
    }

    nav {
        padding-bottom: 0;

        display: inline-block;
    }

    .nav-caption {
        display: none;
    }

    .nav {
        margin-top: 0;
    }

    .nav > li {
        display: inline-block;
    }

    .nav > li > a {
    border-radius: 8px;
    }

    .nav-wrapper,
    article,
    footer {
        margin-right: auto;
        margin-left:auto;

        max-width: 680px;
    }

    article {
        padding: 16px 30px;
    }

    article header {
        font-size: 12px;
        line-height: 1.15;
    }

    figure {
        margin-top: 8px;
        padding: 20px;
    }

    figure > img {
        border-radius: 12px;
    }

    figcaption {
        padding: 10px 0 0;
    }

    footer {
        text-align: center;
    }

    .copyright,
    .imprint,
    .bullet {
        display: inline;
    }

    h1 {
        font-size: 52px;
        line-height: 1.41019;
    }

    h2 {
        font-size: 28px;
        line-height: 1.15;
    }
}

@media screen and (min-width: 820px) {
    body {
        margin: 64px 64px 39px;
    }

    nav {
        padding: 4px;

        display: flex;
    }

    .nav {
    margin-left: auto;
    margin-right: auto;
    }

    .nav-wrapper,
    article,
    footer {
        max-width: 800px;
    }

    article {
        padding: 30px 60px;
    }

    figure {
        margin-top: 16px;
    }
    
    figure > img {
        border-radius: 4px 12px 4px 28px;
    }
}