body {
  background-color:#000;
  padding: 0px;
  margin: 0px;
  text-align: center;
}
/* .pageHeading {
  color: white;
  font-size: larger;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
} */
/* .pageHeading:hover {
  color: aqua;
  /* font-size: small; */
} */
#btn {
  padding: 5px 30px;
  border: 1px 5px;
  font-size: 15px;
  background-color: green;
  color: white;
  font-weight: bold;
}
.class1 {
  max-height: 0px;
  transition: max-height 1s;
  overflow: hidden;
}