body {
  margin: 0;
  display: flex;
  /* This centers our sketch horizontally. */
  justify-content: center;
  /* This centers our sketch vertically. */
  align-items: center;
}

/* i'm using the z index to move the slider on top of the container */
.container {
  z-index: 0;
}

.slider {
  z-index: 1;
  margin-top: 2em;

}