some-css.css

html {
  line-height: 1.15; /* 1 */
  -webkit-text-size-adjust: 100%; /* 2 */
}

body {
  margin: 0;
  font-size: 0.8rem;
}

h1 {
  font-size: 2em;
  margin: 0.8em 0 0.3em;
}

h2 {
  font-size: 1.4em;
  margin: 0.8em 0 0.3em;
}

h3 {
  font-size: 1.2em;
  margin: 0.8em 0 0.3em;
}

p {
  margin: 0 0 1em;
  padding: 0;
}

hr {
  box-sizing: content-box; /* 1 */
  height: 0; /* 1 */
  overflow: visible; /* 2 */
}

a {
  background-color: transparent;
}

b,
strong {
  font-weight: bolder;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}