:root {
    --bg: #033132;
    --fg: #0a5153;
    --lightblue: #158a8e;
    --offwhite: #c6c6c6;
}

body {
    font-family: "Arial";
    color: #ffffff;
    background-color: var(--bg);
    padding: 0;
    margin: 0;
}

#menu {
    padding: 30px 50px;
    background-color: var(--bg);;
    border: 1px solid var(--offwhite);

    display: flex;
    flex-direction: column;

    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

main {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

a:link { color: var(--offwhite); }
a:visited { color: var(--offwhite); }
a:hover { color: #ffff00; }

.grid {
    background-color: var(--fg);
    border-style: solid;
    margin: 5px auto;
}

.grid td {
    width: 20px;
    height: 20px;
}

.s_block { background-color: #ffff00; }
.f_block { background-color: #ff0000; }

.spacing {
    background-color: yellow;
    height: 10px;
}

#leaderboardForm {
    margin: 10px;
    justify-content: center;
}

#leaderboard {
    overflow-y: auto;
    max-height: 265px;
    text-align: center;
    background-color: var(--fg);
}

#leaderboard table {
    width: 100%;
    background-color: var(--fg);
    border-collapse: collapse;
    font-size: 1.1  em;
}

#leaderboard tr {
    border-bottom: 1px solid var(--offwhite);
}

#leaderboard tr:nth-child(even) {
    background-color: var(--lightblue);
}

#leaderboard td {
    padding: 10px 30px;
    text-align: center;
}

#leaderboard th {
    background-color: var(--bg);
    padding: 5px 30px;
}

#mobileControls { display: none; }

@media only screen and (max-width: 600px) {
    #mobileControls {
        margin: 40px 0px;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    #mobileControls button {
        width: 80px;
        height: 80px;
        font-size: 25px;
        color: white;
        background-color: var(--fg);
        border: 1px solid var(--offwhite);
        border-radius: 10px;
        margin: 5px
    }
    #mobileControls button:active {
        background-color: var(--lightblue);
    }
}