@import url('https://fonts.googleapis.com/css?family=Open Sans|Montserrat');
/* Raleway|Oswald|Roboto|Oxygen */

* {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Open Sans', sans-serif;
}

nav {
    position: fixed;
    top: 20px;
    left: 20px;
}

nav a {
    color: #aaa;
    transition-property: color;
    transition-duration: 0.4s;
}

nav ul li {
    list-style: none;
}

#top {
    height: 100vh;
    background: #222;
    display: flex;
    flex-direction: column;
    align-items: center;
}

header {
    color: #fff;
    flex: 1;
    margin-top: 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

h1 {
    font-size: 2rem;
    font-family: Montserrat, sans-serif;
    margin-top: 2.5rem;
}

@media (min-width: 520px) {
    h1 {
        font-size: 3rem;
    }
}

@media (min-width: 670px) {
    h1 {
        font-size: 4rem;
    }
}

h2 {
    color: #666;
    line-height: 2rem;
}

#arrow {
    text-align: center;
    color: #fff;
    font-size: 2rem;
    height: 40px;
    margin-bottom: 20px;
    opacity: 1;
    transition: opacity 0.4s;
}

#bottom {
    height: 90vh;
    background: #666;
}

footer {
    height: 10vh;
    text-align: center;
    font-size: 2rem;
    background: #222;
    display: flex;
    align-items: center;
    justify-content: center;
}

footer a {
    color: #fff;
}