html, body {
  margin: 0;
  padding: 0;
  font-family: Helvetica;
}

canvas {
  position: absolute;
  width: 100%;
  height: 100vh;
  top: 0;
  left: 0;
  z-index: 0;
}

button {
  position: absolute;
  font-size: 2rem;
  z-index: 10;
}

iframe {
  width: 100%;
  min-height: 400px;
  border: none;
}

a {
  font-weight: bold;
  color: black;
}

a:visited {
  font-weight: bold;
  color: black;
}

.p-margin {
  margin: 3rem 0;
}