body {
    background-color: #0d1117;
    color: #e6edf3;
    font-family: 'Courier New', Courier, monospace;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    flex-direction: column;
}

.game-container {
    border: 3px solid #00ff00;
    box-shadow: 0 0 15px #00ff00;
    position: relative;
}

#gameCanvas {
    background-color: #000;
    display: block;
}

.game-ui {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
}

.score-container,
.lives-container {
    font-size: 1.5em;
    color: #00ff00;
}

button {
    background-color: #008000;
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-size: 1em;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #00cc00;
}

.hidden {
    display: none !important;
}

#gameOverScreen,
#rankingScreen {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(0, 0, 0, 0.8);
    border: 2px solid #00ff00;
    padding: 20px;
    text-align: center;
    border-radius: 10px;
    box-shadow: 0 0 20px #00ff00;
}

#highScoreList {
    list-style-type: none;
    padding: 0;
}

#highScoreList li {
    background-color: #000;
    border: 1px solid #00ff00;
    margin-bottom: 5px;
    padding: 8px;
    border-radius: 3px;
    display: flex;
    justify-content: space-between;
}