body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #333;
    overflow: hidden;
}

#simon-says-container {
    text-align: center;
}

#game-panel {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 10px;
    transform: scale(0.9); /* Slight scaling for cool effect */
    opacity: 0.9; /* Slight opacity for cool effect */
}

.button {
    width: 150px;
    height: 150px;
    cursor: pointer;
    border-radius: 50%;
    background: linear-gradient(to bottom, #fff 0%, #ccc 100%);
    box-shadow: 0px 4px 5px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #333;
    transition: transform 0.2s, background-color 0.2s;
}

.button:hover {
    transform: scale(1.05);
    background-color: #f0f0f0;
    box-shadow: 0px 8px 10px rgba(0, 0, 0, 0.3);
}

#green {
    background: linear-gradient(to bottom, #00cc00 0%, #009900 100%);
    transition: background-color 0.2s;
}

#red {
    background: linear-gradient(to bottom, #cc0000 0%, #990000 100%);
    transition: background-color 0.2s;
}

#yellow {
    background: linear-gradient(to bottom, #ffff00 0%, #cccc00 100%);
    transition: background-color 0.2s;
}

#blue {
    background: linear-gradient(to bottom, #0000cc 0%, #000099 100%);
    transition: background-color 0.2s;
}

#start-button {
    background: #f0f0f0;
    padding: 10px 20px;
    border: none;
    font-size: 24px;
    cursor: pointer;
    transition: background-color 0.2s;
}

#start-button:hover {
    background: #ccc;
}