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

div.description {
    margin: 0;
    padding-top: 0px;
    padding-right: 10px;
    text-align: right;
    background-color: #798395;
}


/* unvisited link */

.header a:link {
    color: white;
    text-decoration: none;
}


/* visited link */

.header a:visited {
    color: white;
}


/* mouse over link */

.header a:hover {
    color: black;
}


/* selected link */

.header a:active {
    color: black;
    color: white;
}

.background {
    width: 100%;
    height: 100vh;
    background-image: linear-gradient(rgba(12, 3, 51, 0.3), rgba(12, 3, 51, 0.3));
    position: relative;
    padding: 0 5%;
    display: flex;
    align-items: center;
    justify-content: center;
}

nav {
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    padding: 20px 8%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

nav.logo {
    width: 80px;
}

nav ul li {
    list-style: none;
    display: inline;
    margin-left: 40px;
}

nav ul li a {
    text-decoration: none;
    color: white;
    font-size: 17px;
    font-weight: bold;
}

.content {
    text-align: center;
    padding-bottom: 0;
    margin-bottom: 0;
}

.content h2 {
    font-size: 160px;
    color: white;
    transition: 0.5s;
}

.content h2:hover {
    -webkit-text-stroke: 2px white;
    color: transparent;
}

.content a {
    text-decoration: none;
    display: inline-block;
    color: white;
    font-size: 24px;
    border: 2px solid white;
    padding: 14px 70px;
    border-radius: 50px;
    margin-top: 20px;
    margin-bottom: 0;
    padding-bottom: 15px;
    transition: 0.5s;
}

.content a:hover {
    -webkit-text-stroke: 2px white;
    color: transparent;
}

ul.topnav li:not(:nth-child(5)) :hover {
    border: 2px solid white;
    background-color: transparent;
    color: black;
    border-radius: 20px;
    padding: 14px 20px;
}

.back-video {
    position: absolute;
    right: 0;
    bottom: 0;
    z-index: -1;
    width: 100%;
}

.topnav .dropdownicon {
    display: none;
}

@media (min-aspect-ratio: 16/9) {
    .back-video {
        width: 100%;
        height: auto;
    }
}

@media (max-aspect-ratio: 16/9) {
    .back-video {
        width: auto;
        height: 100%;
    }
}


/* Responsive layout - when the screen is less than 800px wide, make the two columns stack on top of each other instead of next to each other */

@media screen and (max-width: 1600px) {
    div.content h2 {
        width: 100%;
        font-size: 90px;
    }
}


/* mobile */

@media screen and (max-width: 680px) {
    .back-video,
    .content {
        opacity: 0.6;
    }
    .topnav a {
        float: none;
        width: 100%;
    }
    ul.topnav li:not(:nth-child(1)) {
        display: none;
    }
    ul.topnav li.dropdownicon {
        display: block;
        float: right;
    }
    ul.topnav.responsive li.dropdownicon {
        position: absolute;
        top: 0;
        right: 0;
    }
    ul.topnav.responsive {
        position: relative;
    }
    ul.topnav.responsive li {
        display: inline;
        float: none;
    }
    ul.topnav.responsive li a {
        display: block;
        text-align: left;
    }
}