* {
    margin: 0;
    box-sizing: border-box;
}

div {
    width: 80vw;
    margin: auto;
    background-color: lightgray;
    text-align: center;
}

header {
    background-color: lightblue;
}

header h1 {
    color: darkblue;
    font-size: calc(4px + 4vw);
}
header p {
    font-size: calc(2px + 2vw);
}

nav {
    background-color: lightgreen;
}

nav ul {
    padding-left: 0;
}

nav ul li {
    display: inline;
    font-size: calc(1px + 1.5vw);
    margin: 2%;
}

nav li a {
    text-decoration: none;
}

nav li a:hover, footer a:hover {
    color: white;
}

main {
    background-color: lightyellow;
}

main p {
    color: darkred;
    border: 2px solid darkred;
    font-size: calc(1px + 2vw);
}

main img {
    max-width: 100%;
}

footer {
    background-color: lightgreen;
}

footer p {
    font-size: calc(2px + 2vw);
}

img {
    max-width: 100%;
}