body {
    margin: 0;
    display: flex;
}
a {
    text-decoration: none;
}
a:hover {
    background: rgba(0, 0, 0, 0.4);
}
a:active {
    background: rgba(0, 0, 0, 0.2);
}
main {
    width: 100vw;
    height: 100vh;
    overflow-y: auto;
    overflow-x: auto;
}
::-webkit-scrollbar {
    display: none;
}

btn {
    padding: 1em 2em;
    background: rgba(128, 128, 128, 0.1);
}


nav {
    height: 100vh;
}
nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}
nav li:hover {
    background: rgba(0, 0, 0, 0.1);
}