body,
html {
    width: 100%;
    height: 100%;
}

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    outline: none;
    text-decoration: none;
    font-family: 'Roboto', sans-serif;
    list-style: none;
}

.board-container {
    display: block;
    margin: auto;
    width: 390px;
    text-align: center;
}

.board {
    display: inline-block;
    padding: 4px;
    margin: 8px;
}

.board .row {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
}

.board .row .cell {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 92px;
    height: 92px;
    border: 1px solid rgba(0, 0, 0, 0.2);
    font-family: sans-serif;
    font-size: 32px;
    cursor: pointer;
    user-select: none;
}

.board .row .cell.locked {
    pointer-events: none;
    background-color: rgba(0, 0, 0, 0.15);
    color: blue;
}

.board .row .cell.active {
    background-color: rgba(255, 255, 0, 0.25);
}

.board .row .cell.marked {
    background-color: rgba(0, 0, 0, 0.05);
}

.bottom-container {
    max-width: 372px;
    padding: 12px;
}

.action-container {
    display: flex;
    justify-content: space-around;
}

.action-container button {
    padding: 4px 8px;
    box-shadow: 2px 2px 2px 2px rgba(0, 0, 0, 0.1);
    cursor: pointer;
}

.title {
    margin-bottom: 8px;
}

.description {
    text-align: left;
    padding: 32px;
    margin-top: 16px;
    white-space: pre-wrap;
    display: inline-block;
}

body>header {
    background-color: rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    height: 40px;
}

body>header a {
    margin: 0 16px;
    border-radius: 4px;
    border: 1px solid #444;
    color: #fff;
    background-color: blue;
    font-size: 16px;
    padding: 4px 6px;
}

.current-player {
    padding: 16px;
}