styles.css

/* Styles for the game board */
#game-board {
    display: grid;
    grid-template-columns: repeat(var(--grid-size), var(--cell-size));
    grid-template-rows: repeat(var(--grid-size), var(--cell-size));
    background-color: #CCC;
    gap: var(--cell-gap);
    border-radius: 1vmin;
    padding: var(--cell-gap);
    position: relative;
}

/* Styles for each cell in the game board */
.cell {
    background-color: #AAA;
    border-radius: 1vmin;
}

/* Styles for the game tiles */
.tile {
    position: absolute;
    display: flex;
    justify-content: center;
    align-items: center;
    width: var(--cell-size);
    height: var(--cell-size);
    background-color: red;
    border-radius: 1vmin;
    top: calc(var(--y) * (var(--cell-size) + var(--cell-gap)) + var(--cell-gap));
    left: calc(var(--x) * (var(--cell-size) + var(--cell-gap)) + var(--cell-gap));
    font-weight: bold;
    background-color: hsl(200, 50%, var(--background-lightness));
    color: hsl(200, 25%, var(--text-lightness));
    animation: show 200ms ease-in-out;
    transition: 100ms ease-in-out;
}

/* Animation for showing tiles */
@keyframes show {
    0% {
    opacity: .5;
    transform: scale(0);
    }
}

/* Styles for the body of the document */
body {
    color: #776e65;
    font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif;
    font-size: 18px;
    background-image: url('d3.jpg');
}

/* Styles for anchor tags */
a {
    color: #776e65;
}

/* Styles for horizontal rule */
hr {
    border: none;
    border-bottom: 1px solid #d8d4d0;
    margin-top: 20px;
    margin-bottom: 30px;
    overflow: hidden;
}

/* Styles for the main container */
.container {
    width: 500px;
    margin: 0 auto;
    margin-top: 30px;
    position: absolute;
    left: 50%;
    transform: translate(-50%, 0);
}

/* Styles for the heading section */
.heading {
    height: 112px;
    display: flex;
    justify-content: center;
}

/* Styles for the title element */
.title {
    font-size: 80px;
    margin: 0;
}

/* Styles for the score container */
.score-container {
    display: flex;
    margin: 0;
}

/* Styles for the score box */
.score-box {
    margin-top: 8px;
    height: 30%;
    background-color: #BBADA0;
    color: white;
    border-radius: 3px;
    text-align: center;
    top: 0;
    padding: 15px 25px;
    font-weight: bold;
}

/* Styles for the max score */
#max-score {
    margin-left: 5px;
}

/* Styles for the score type */
.score-type {
    color: #eee4da;
    width: 100%;
    font-size: 13px;
    padding-bottom: 3px;
}

/* Styles for the section above the game board */
.above-game {
    display: flex;
    justify-content: space-between;
}

/* Styles for the restart button */
.restart-button {
    background: #8f7a66;
    border-radius: 3px;
    padding: 0 20px;
    color: #f9f6f2;
    height: 40px;
    line-height: 42px;
    cursor: pointer;
    text-align: center;
    font-weight: bold;
}

/* Styles for the game container */
.game-container {
    margin-top: 40px;
    position: relative;
    padding: 15px;
    background: #bbada0;
    border-radius: 6px;
    width: 500px;
    height: 500px;
    box-sizing: border-box;
}

/* Styles for the "How to play" section */
.how-to-play {
    margin-bottom: 10px;
    line-height: 1.65;
    margin-top: 30px;
    border-radius: 1px;
}

/* Styles for the footer section */
footer {
    text-align: center;
}

/* Styles for the "Thank You" message */
.thank-you {
    font-weight: bold;
}

/* Styles for the salutation */
.salutation {
    font-size: 13px;
    color: #BBADA0;
    margin-bottom: 30px;
}