html,body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

body{
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1a1a1a;
    flex-direction: column;
}

canvas{
    
    border: 20px solid #ddd;
    border-radius: 10px;
    visibility: hidden;
}

#restartBtn {
    margin-top: 15px;
    padding: 10px 20px;
    font-size: 18px;
    background: #ff4757;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    display: none;
}

#restartBtn:hover{
    background: #e84118;
}