styles.css

#parentdiv {
    position: relative;
    width: 150px;
    height: 150px;
    background-color: white;
    border-radius: 150px;
    margin: 150px;
  }
  
  .div2 {
    position: absolute;
    width: 100px;
    height: 100px;
    background-color: #ac5;
    border-radius: 100px;
  }

.game-area{
    display: grid;
    justify-content: center;
    align-content: center;
    text-align: center;
}

#overlay {
  position: fixed;
  display: none;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.7);
  z-index: 2;
}

#overlay>h1 {
    position: absolute;
    top: 10%;
    left: 50%;
    font-size: 50px;
    color: white;
    transform: translate(-50%,-50%);
    -ms-transform: translate(-50%,-50%);
}

.text{
  position: absolute;
  top: 50%;
  left: 50%;
  font-size: 35px;
  color: white;
  transform: translate(-50%,-50%);
  -ms-transform: translate(-50%,-50%);
}

/*You can change the top remarks height from here*/
#remarks {
  height: 30px;
}

#score {
  color: orangered;
}

#play-again{
  position: absolute;
  top: 70%;
  left: 50%;
  font-size: 30px;
  background-color: orange;
  color: white;
  transform: translate(-50%,-50%);
  -ms-transform: translate(-50%,-50%);
  outline: 0;
  border-radius: 9px;
}

#start-overlay {
  position: fixed;
  display: none;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.8);
  z-index: 2;
}

#start-overlay>h1 {
  position: absolute;
  top: 10%;
  left: 50%;
  font-size: 50px;
  color: white;
  transform: translate(-50%,-50%);
  -ms-transform: translate(-50%,-50%);
}

#play {
  position: absolute;
  top: 70%;
  left: 50%;
  font-size: 30px;
  background-color: orange;
  color: white;
  transform: translate(-50%,-50%);
  -ms-transform: translate(-50%,-50%);
  outline: 0;
  border-radius: 9px;
}