html {
    font-family: monospace;
}

body {
    height: 100vh;
    margin: 0;
}

body, main, section, div {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

header {
    text-align: center;
}

main {
    flex-basis: 100%;
}

main img {
    max-height: 40vh;
}

section {
    justify-content: space-evenly;
    flex-basis: 100%;
}

footer {
    flex-basis: 10%;
    font-size: 18px;
}

/* ---- My Big Button ---- */

button {
    font-family: monospace;
    font-size: 34px;
    width: 60vw;
    height: 40vh;
    border-radius: 20px;
    background-color: lightgray;
    border: 10px dashed green;
    cursor: pointer;
    outline: none;
}

/* ---- Anonymous ---- */

.anonymous img {
    filter: brightness(0);
}

.anonymous img.reveal {
    transition: filter 1s ease;
    filter: brightness(1);
}

/* ---- Dominoes ---- */
.dominoes {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    flex-basis: initial;
}

.dominoes div {
    width: 5vw;
    height: 5vw;
    margin: 0.1vw;
    background-color: black;
    display: block;
}

.dominoes div:nth-child(2n + 1) {
    background-color: green;
}