body {

text-align: center

}
#canvas{
    padding: 19px;
}
#d1 {
      background-color: black;
    margin-left:3% ;
    width: min(1000px, 100%);
  }

@media (max-width: 767px) {
  #d1 {
    margin: 0;
  }

  #canvas {
    display: block;
    width: 100%;
    height: auto;
    box-sizing: border-box;
  }

  body > p {
    margin: 10px 12px;
    line-height: 1.5;
  }
}