body {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: #ffffff;
  gap: 15px;
  font-family: Arial, Helvetica, sans-serif;
}
h1 {
  font-size: 24px;
  text-align: center;
}

p {
  font-size: 14px;
  text-align: center;
  line-height: 20px;
}

header,
main,
footer {
  max-width: 950px;
}
header {
  width: 100%;
  background-size: cover;
  background-repeat: no-repeat;
}
main {
  display: flex;
  flex-direction: column;
  gap: 15px;
}


img {
  max-width: 100%;
}
#introduccion {
  background-size: cover;
  background-position-x: right;
  background-repeat: no-repeat;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 15px;
  padding: 15px 30px;
}
#img-portada {
  flex-basis: 40%;
}
#txt-portada {
  flex-basis: 55%;
}