Test Marp Markdown theme.

theme.css

/* @theme rk */

@import 'default';

h1, h2, h3 {
  color: #ffffff;
}

section {
  background-image: linear-gradient(to bottom, #67b8e3, #0288d1);
}

ul {
  display: flex;
  flex-direction: column;
  list-image: none;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.2rem;
}

li {
  color: rgba(255,255,255,0.95);
  border: 1px solid rgba(255,255,255,0.3);
  padding: 0.5rem;
  background: rgba(255,255,255,0.05);
  border-radius: 0.2rem;
}

section h1 {
  color: #ffffff;
}