body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #2c3e50;
    font-family: 'Courier New', Courier, monospace;
}

.game-container {
    position: relative;
    width: 800px;
    height: 400px;
    border: 4px solid #fff;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    background-color: #87CEEB; /* Sky color */
    overflow: hidden;
}

.game-container:fullscreen {
    width: 100vw;
    height: 100vh;
    border: none;
    background-color: #000;
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    display: block;
}

#gameOverScreen, #startScreen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.hidden {
    display: none !important;
}

button {
    padding: 10px 20px;
    font-size: 18px;
    font-family: inherit;
    background-color: #e74c3c;
    color: white;
    border: 2px solid white;
    cursor: pointer;
    margin-top: 20px;
    text-transform: uppercase;
}

button:hover {
    background-color: #c0392b;
}

#fullscreenBtn {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 20;
    padding: 8px 12px;
    font-size: 14px;
    background: rgba(0,0,0,0.5);
    border: 1px solid rgba(255,255,255,0.3);
    margin-top: 0;
    border-radius: 4px;
    text-transform: none;
}

#fullscreenBtn:hover {
    background: rgba(0,0,0,0.8);
}

h2 {
    font-size: 40px;
    margin: 0 0 10px 0;
    text-shadow: 2px 2px 0 #000;
}
p {
    font-size: 20px;
    margin: 10px 0;
}