style.css

.container {
    position: relative;
    width: 100%;
    height: 100%;
    font-size: 14px;
    background-color: #f2f2f2;
}

.cover-tile {
    fill: #dddddd;
    stroke: #333333;
    cursor: pointer;
}

.cover-tile:hover {
    fill: #eeeeee;
    stroke: #333333;
    cursor: pointer;
}

.screen {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    font-family: monospace;
    font-size: 2em;
}

.toolbar {
    display: flex;
    padding: 0.25em;
    border: 1px solid #ccc;
}

.mines,
.time {
    border: 1px solid #ccc;
    padding: 0.1em 0.25em;
}

.state {
    text-align: center;
    flex: 1;
}

.screen svg {
    flex: 1;
}

.results {
    position: absolute;
    width: 100%;
    height: 100%;
    text-align: center;
    background: rgba(255, 255, 255, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.results-content {
    padding: 1em;
    background: rgba(255, 255, 255, 0.6);
}