* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1.125rem;
    line-height: 1.6;
    color: #111;
    background: #fff;
}

.skip-link {
    position: absolute;
    left: 0;
    top: -100px;
    padding: 0.75rem 1rem;
    background: #fff;
    color: #000;
    border: 2px solid #000;
    z-index: 1000;
}

.skip-link:focus {
    top: 0;
}

header,
main,
footer {
    max-width: 70rem;
    margin: 0 auto;
    padding: 1rem;
}

header img {
    display: block;
    max-width: 100%;
    height: auto;
}

nav ul {
    list-style: none;
    margin: 1rem 0 0;
    padding: 0;
}

nav li {
    display: inline-block;
    margin-right: 1rem;
}

a {
    color: #004f9e;
}

a:hover,
a:focus {
    text-decoration-thickness: 0.2em;
}

a:focus {
    outline: 3px solid #000;
    outline-offset: 3px;
}

main {
    min-height: 60vh;
}

h1,
h2,
h3 {
    line-height: 1.2;
}

footer {
    border-top: 1px solid #aaa;
    margin-top: 2rem;
}