body {
  font-family: Arial, sans-serif;
  background-image: url("paragifsintigo/tierra.jpg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  background-attachment: fixed;
}
h1 {
  font-size: 37px;
  margin: auto;
  color: rgb(224, 15, 15);
}
#countdown {
  font-size: 37px;
}
.cuentatras{
  background-color: rgba(90, 222, 178, 0.904);
  height: auto;
  width: 35vw;
  border-radius: 15px;
  margin: auto;
  margin-top: 8vw;
  padding: 2vw;
  text-align: center;
}

@media all and (width < 500px){
  h1 {
    font-size: 30px;
    margin: auto;
    color: rgb(224, 15, 15);
  }
  #countdown {
    font-size: 30px;
  }
  .cuentatras{
    background-color: rgba(90, 222, 178, 0.904);
    height: auto;
    width: 65vw;
    border-radius: 15px;
    margin: auto;
    margin-top: 50%;
    padding: 2vw;
  }
}