html, body {
  margin: 0;
  padding: 0;
}

canvas {
  display: block;
}

#containerX {
  width: 80%;
  margin: 0 auto;
  padding: 5px;
  border: 1px green solid;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 8px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

#table6 {
  /* id of a table */
  /*margin: 0 auto; */
  margin: 0 auto;
  margin-top: 15px;
  width: 200px;
  border-collapse: collapse;
}