body {
  overflow: hidden;
  background: rosybrown;
}

.bill {
  width: 150px;
  animation: 6s ease-in fall;
  position: absolute;
  top: 100%;
  border: solid 0.5px black;
  cursor: pointer;
  user-select: none;
}

#count {
  z-index: 1;
  position: fixed;
  top: 40px;
  right: 40px;
  background: white;
  border: solid 1.5px black;
  padding: 10px 25px;
  font-size: 30px;
}

@keyframes fall {
  from {
    top: -75px;
  }
  to {
    top: 100%;
  }
}