body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    max-width: 100vw;
    display: flex;
    justify-content: center;
    background: #111;
    font-family: sans-serif;
}

#buttons {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.button-holder {
    margin: 10px;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    background: lightblue;
    transition: ease 0.2s;
}

a, a:visited {
    color: black;
    text-decoration: none;
}

.button-holder:hover {
    background: darkblue;
    color: white;
    transition: ease 0.2s;
}