.main {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
  .canvas {
    border: 2px solid black;
  }
  .top,
  .bottom {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    margin: 20px 0 20px 0;
  }
  .block,
  input,
  select,
  button {
    width: 80%;
  }
  .top > block {
    margin: 10px;
  }
  .bottom > button {
    margin: 10px;
  }
  .block > p {
    margin: 10px auto;
    width: 50%;
  }