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

.nav-menu {
    width: 60%;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-self: center;
    flex-direction: column;
}

nav {
    display: flex;
    width: 15%;
    text-align: center;
    flex-direction: column;
    margin: 0 auto;
}

h1 {
    text-align: center;
}

a {
    text-decoration: none;
    padding: 5px;
    margin: 5px;
    border: 2px solid black;
    color: black;
    transition: 0.4s;
}

a:hover {
    border: 2px solid white;
    color: white;
    background: purple;
    transition: 0.4s;
}