html {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Helvetica, Arial, sans-serif;
}

header {
  background: url(https://concepto.de/wp-content/uploads/2019/02/paisaje-natural-item-5.jpg);
  filter: grayscale(100%);
  background-repeat: no-repeat;
  width: 100%;
  height: 125px;
}
header h1 {
  margin: 0;
  text-align: center;
  color: whitesmoke;
  font-size: 40px;
  padding: 15px;
}
header nav ul {
  text-align: center;
}
header nav li {
  list-style: none;
  display: inline-block;
  font-size: 15px;
}
header nav li a {
  color: whitesmoke;
  text-decoration: none;
  padding: 5px 5px;
  margin: 0 5px;
}
header nav li a:hover {
  background-color: #333;
  opacity: 0.2;
  filter: drop-shadow(16px 16px 20px #333);
}

main {
  position: relative;
  height: 80%;
}
main p {
  position: relative;
  display: inline-block;
  padding: 60px 60px;
  margin: 10px 10px;
  border: 1px solid whitesmoke;
  font-size: 40px;
  border-radius: 10px;
}
main p a {
  text-decoration: none;
  color: whitesmoke;
}
main p:hover {
  background-color: black;
  opacity: 0.1;
  filter: drop-shadow(16px 16px 20px #333);
  text-shadow: 15px 15px 15px #000;
}

footer {
  display: flex;
  justify-content: center;
  align-content: end;
  height: 100px;
  background-color: #333;
  color: whitesmoke;
  font-size: 10px;
}
footer p {
  padding: 70px 0 0 0;
}

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