body {
  padding: .9em;
  font-family: serif;
  font-size: calc(3em + .5vw); 
}

@media only screen and (max-width: 600px) {
  body {
    padding: .8 em;
    font-size: 2em;
  }
}

#nice {
  margin-bottom: 2vh;
}

#mobile {
  display: none;
  margin-bottom: 1vh;
}

nav {
  margin-bottom: 7vh;
  margin-top: 5vh;
}

a {
  color: blue;
  text-decoration: none;
  transition: all 500mx;
}

a:hover {
  color: #3700ff;
}

::selection {
  background: red;
  color: white;
  text-transform: uppercase;
}

div {
  display: none;
}

@media only screen and (max-width: 768px) {
  div {
    display: block;
    font-size: .8em;
  }
}

  #nice {
    display: none;
  }
  
  #mobile {
    display: block;
  }
  
  details {
    margin-top: 1vh;
    font-size: .85em;
  }
  
  nav {
  margin-bottom: 3.5vh;
  margin-top: 5vh;
  }
}