nav {
    background-color: blue;
    color: white;
    height: 100vh;
    width: 3em;
    padding: 0.5em 1em;
    position: fixed;
    top: 0;
    right: 0;
    display: flex;
    flex-direction: column;
}

svg {
    aspect-ratio: 1;
    margin: 0.5em 0;
    opacity: 0.5;
    transition-duration: 0.2s;
}

nav div {
    display: flex;
    flex-direction: column;
}

#second-container {
    margin-top: auto;
    margin-bottom: 0.7em;
}

svg:hover {
    transition-duration: 0.5s;
    opacity: 1;
    filter: drop-shadow(0 0 1em white); /*in the tutorial video, was 2em*/
}