body {
    background-color: steelblue;
    font-family: sans-serif;
    padding: 1em;
}

.instructions h3 {
    color: white;
    font-weight: bold;
    margin: 3px 0;
}

table.board {
    padding: 0;
    border: 0.1em black solid;
    background-color: lightblue;
    margin: 10px;
    display: inline-block;
}

td.square {
    border: 2px black solid;
    margin: 2px;
    width: 2em;
    height: 2em;
    display: inline-block;
}

td.square_off {
    background-color: #222;
}

td.square_on {
    background-color: lightgray;
}

td.square_selected {
    border: 0.4em purple solid;
    width: 1.5em;
    height: 1.5em;
}

.buttons button {
    margin: 10px;
    padding: 0.6em 3em;
}

.divider {
    height: 1em;
}

.results h3 {
    color: white;
    margin-bottom: 0;
}

#donate-message {
    display: inline-block;
    margin-left: 10px;
}

#donate-message p {
    color: white;
    display: table-cell;
    height: 100%;
    vertical-align: middle;
}

#donate-button {
    display: inline-block;
    margin-left: 10px;
}

.loader {
    border: 5px solid white; /* Light grey */
    border-top: 5px solid darkblue;
    border-radius: 50%;
    width: 15px;
    height: 15px;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin: auto;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.message p {
    font-weight: bold;
    background-color: lightblue;
    width: auto;
    display: inline-block;
    padding: 1em;
}

.message p.error {
    color: red;
}

.message p.warn {
    color: darkgoldenrod;
}