body {
    font-family: Arial, helvetica, sans-serif;
    text-align: center;
}

hr {
    width: 500px;
}

#board {
    width: 400px;
    height: 400px;
    position: relative;
    background-color: #cdc1b5;
    border: 6px solid #bbada0;
    position: relative;
    margin: auto;
    display: flex;
    flex-wrap: wrap;   
    border-radius: 10px;
}

.tile {
    width: 90px;
    height: 90px;
    border: 5px solid #bbada0;
    font-size: 30px;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    background-color: #cdc1b5;   
    text-align: center;
    line-height: 100px;
    border-radius: 10px;
}
.x2 {
    background-color: #eee4da;
    color: #727371;

}
.x4 {
    background-color: #ece0ca;
    color: #727371;
}
.x8 {
    background-color: #f4b17a;
    color: white;
}
.x16 {
    background-color: #f59563;
    color: white;
}
.x32 {
    background-color: #f67c5f;
    color: white;
}
.x64 {
    background-color: #f65e3b;
    color: white;
}
.x128 {
    background-color: #edcf72;
    color: white;
}
.x256 {
    background-color: #edcc61;
    color: white;
}
.x512 {
    background-color: #edc850;
    color: white;
}
.x1024 {
    background-color: #edc53f;
    color: white;
}
.x2048 {
    background-color: #edc22e;
    color: white;
}
.x4096 {
    background-color: #edc22e;
    color: white;
}
.x8192 {
    background-color: #edc22e;
    color: white;
}
.x16384 {
    background-color: #edc22e;
    color: white;
}
@keyframes pop {
    0% { transform: scale(0); }
    80% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.tile.x2,
.tile.x4,
.tile.x8,
.tile.x16,
.tile.x32,
.tile.x64,
.tile.x128,
.tile.x256,
.tile.x512,
.tile.x1024,
.tile.x2048 {
    animation: pop 0.2s ease;
}
.tile img {
    border-radius: 10px;
    pointer-events: none; /* prevent accidental drag or selection */
}