:root {
  color-scheme: dark light;  
}

body {
  font-family: helvetica, arial, sans-serif;
  margin: 2em;
}

@media (prefers-color-scheme: dark) {
  background-color: #000;
}

h1 {
  color: #373fff;
}

h2 {
  color: red;
}

svg {
  width: 100%;
  max-width: 100%;
  height: auto;
}

button {
  visibility: hidden;
}

.highlight {
  fill: forestgreen;
}