*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    background:#87CEEB;
    display:flex;
    justify-content:center;
    align-items:center;
    height:100vh;
    overflow:hidden;
    font-family:Arial, sans-serif;
}

canvas{
    width:95%;
    max-width:900px;
    border:4px solid #222;
    border-radius:12px;
    background:linear-gradient(#87CEEB,#FFE0A3);
    box-shadow:0 15px 40px rgba(0,0,0,.4);
}



<style>

#juego {
    width: 100%;
    text-align: center;
}

#game {
    display: block;
    margin: 0 auto;
}

#controles {
    display: flex;
    justify-content: center;
    gap: 20px;
    width: 100%;
    margin-top: 15px;
}

#controles button {
    width: 75px;
    height: 75px;

    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.7);

    background: rgba(255, 255, 255, 0.35);

    color: #222;

    font-size: 14px;
    font-weight: bold;

    box-shadow:
        0 4px 8px rgba(0, 0, 0, 0.25),
        inset 0 1px 3px rgba(255, 255, 255, 0.6);

    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);

    touch-action: none;
    user-select: none;
    -webkit-user-select: none;

    transition: transform 0.08s;
}

#controles button:active {
    transform: scale(0.88);

    background: rgba(255, 255, 255, 0.55);

    box-shadow:
        0 2px 4px rgba(0, 0, 0, 0.25),
        inset 0 2px 4px rgba(0, 0, 0, 0.15);
}
</style>