style.css

body {
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 18px;
  padding: 0;
  margin: 0;
}

header {
  background-color: rgb(255, 195, 228);
  padding: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header a {
  font-weight: bolder;
  text-decoration: none;
  color: black;
  font-size: 2em;
}

header button {
  border-radius: 5px;
  cursor: pointer;
  font-size: 1em;
  padding: 10px;
  border: none;
  background: transparent;
}

header button:hover {
  background-color: black;
  color: white;
}

main {
  width: 80%;
  margin: 0 auto;
}

main h1 {
  font-size: 4em;
}

main .portada {
  width: 100%;
}

main .datos {
  padding-bottom: 30px;
}

main p {
  font-size: 2.5em;
}

main a {
  color: rgb(243 104, 24);
}

main blockquote {
  font-size: 2em;
  border-left: solid 15px greenyellow;
  background-color: yellowgreen;
  padding: 20px;
}

main img {
  width: 100%;
  height: auto;
}

body.darkmode {
  background-color: rgb(32, 32, 44);
  color: white;
}

.darkmode header {
  background-color: rgb(12, 12, 12);
  color: white;
}

.darkmode header a {
  color: white;
}

.darkmode button {
  color: white;
}

.darkmode button:hover {
  background-color: white;
  color: black;
}

.darkmode main blockquote {
  border-left-color: #333;
  background-color: #222;
}