#dotMatrix {
  width: 100px;
  height: 100px;
}

#dots, #triangle {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 10;
  left: 0;
}

#triangle {
  z-index: -1;
}

.dot {
  height: 3px;
  width: 3px;
  background-color: black;
  opacity: 50%;
  border-radius: 50%;
  display: inline-block;
}

polygon {
  fill:palevioletred;
  stroke-width:0;
  fill-opacity: 100%;
}

svg {
  width: 900px;
  height: 900px;
}