*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; width: 100%; height: 100%; overflow: hidden; background-color: #222; }

body {
    display: flex;
    justify-content: center;
    align-items: center;
}

#game-box {
    display: flex;
    flex-direction: column; 
    align-items: center;
    position: relative;
}

#canvas {
    display: block;
    border: 2px solid #fff;
    width: 95vw; 
    height: auto; 
    max-height: 80vh; 
}


#pauseBtn {
    margin-top: 15px;  
    padding: 10px 40px;
    font-size: 18px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    user-select: none; 
    -webkit-tap-highlight-color: transparent;
}

#pauseBtn:active {
    transform: scale(0.95);
}

#pauseBtn.hidden {
    opacity: 0 !important;
    pointer-events: none;
}