html, body, #app, .main {
  height: 100%;
}
body {
  margin: 0;
}
.main {
  cursor: pointer;
  width: 100%;
  height: 100%;
  transition: background-color 5s;
}
svg {
  position: fixed;
  display: block;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.9;
  transition: filter 5s;
}
path {
  stroke-width: 1px;
  transition: fill 3s, stroke 5s;
  fill-rule: evenodd;
}