Set default rem css

/* Document level adjustments */
html {
  font-size: 17px;
}
@media (max-width: 900px) {
  html { font-size: 15px; }
}
@media (max-width: 400px) {
  html { font-size: 13px; }
}

/* Type will scale with document */
h1 {
  font-size: 3rem;
}
h2 {
  font-size: 2.5rem;
}
h3 {
  font-size: 2rem;
}

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