html, body {
    background-color: #333;
    color: black;
    height: 100%;
    margin: 0;
    padding: 0;
}

main {
    align-items: center;
    border: 0;
    display: flex;
    height: 100%;
    justify-content: center;
    margin: 0;
    padding: 0;
    width: 100%;
}

button {
    background-color: #bbb;
    border-radius: 100px;
    font-size: 32px;
    padding: 50px 52px;
}

button:active {
    background-color: #ab2222;
}