:root{
  --bigcounter:0rem;
}
#clickBtn{
  background-color:white;
  border: 1px solid black;
  border-radius: 10px;
  color:black;
  height: 3rem;
  transition: ease 0.2s background-color, ease 0.2s border, ease 0.2s color, ease 0.2s height, ease 1s font-size;
  font-size: 1rem;
  font-weight: bold;
  margin: 1rem;
}

#clickBtn:hover{
  background-color: black;
  border: 1px solid white;
  height: 10rem;
  font-size: 1.5rem;
  color: white;
}
#clickBtn:active{
  background-color:transparent;
  font-size: calc(1.2rem + var(--bigcounter));
  transition: 0.1s cubic-bezier(0, 1, 0, 1);
}
.tiempoDiv{
  background-color: white;
  border-radius: 1rem;
  padding: 0.2rem;
  box-shadow: 0 4px 10px;
  margin: 1rem;
}
.container{
  display: grid;
  align-items: center;
  align-content: center;
  text-align: center;
  justify-content: center;
}
#rickroll{
  height: 10px;
  width: 10px;
  display: none;
}
body{
  background: url("https://k60.kn3.net/taringa/8/0/2/4/C/E/Greoklanky/B6E.gif") fixed;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}