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

html {
    font-size: 100%;
    height: 100%;
}

body {
    line-height: 1.4;
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    height: 100%;
}

p {
    font-size: 1.25em;
    margin-bottom: 1.75rem;
}

h1 {
    font-size: 2.4em;
    margin-bottom: 3.5rem;
}

h2 {
    font-size: 2em;
    margin-bottom: 1.75rem;
}

h3 {
  font-size: 1.5em;
  margin-bottom: 1.75rem;
}

img {
    max-width: 100%;
}

.header {
    padding: 1.75rem;
    background-color: #496849;
    color: white;
    display: flex;
    flex-direction: column;
}

.main-title {
    margin-bottom: 0;
}

.nav {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: space-between;
}

.nav a {
    font-size: 1.25rem;
    color: white;
}

.container {
    width: 100%;
    padding: 1.75rem;
}

.footer {
    padding: 1.75rem;
    background-color: #496849;
    color: white;
    margin-top: auto;
}

iframe {
    width: 100%;
    height: 700px;
}

@media (min-width: 67em) {
    html {
        font-size: 112.5%;
    }

    h1 {
        font-size: 3em;
    }

    .container {
        max-width: 67rem;
        padding-left: 1.5rem;
        padding-right: 1.5rem;
        margin: 0 auto;
    }

    .header {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .nav {
        width: 20em;
    }
}