#start-screen, #game-over-screen {
  /* change to shared class =  title */
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -40%);
  opacity: 1;
  text-align: center;
  transition: opacity .5s;
}
.title, #game-over-screen {
  /* change to shared class =  title */
  font-size: 80px;
  width: 500px;
  color: midnightblue;
  line-height: 100%;
  font-family: 'Mali', cursive;
}
.start-button {
  width: 75%;
  margin-top: 30px;
  background-color: rgba(0,0,0,0.6);
  border: none;
  border-radius: 50px;
  border: 5px solid rgba(255,255,255,0.5);
  font-size: 40px;
  color: #E0D0D0;
  box-shadow: 0px 0px 15px gold;
  font-family: 'Mali', cursive;
  cursor: pointer;
  opacity: 1;
  transition: background-color .5s, box-shadow 1s, margin-top .3s, font-size .3s;
}
.start-button:hover {
  background-color: rgba(0,0,0,0.5);
  font-size: 42px;
  margin-top: 28px;
  box-shadow: 0px 0px 125px gold;
  transition: background-color .5s, box-shadow .5s, margin-top .3s, font-size .3s;
}
.start-button:focus {
  outline: none;
}
#game-over-screen {
  font-size: 50px;
  width: 100%;
  display: none;
}
.popped_ballons {
  margin: 30px;
  font-size: 100px;
}