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

body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #f0f0f0;
}

#canv1 {
    width: 600;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

canvas {
  display: block;
}