style.css

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  min-height: 100vh;
  min-width: 600px;
  /* !Change the background image(cake) */
  background-image: url(./images/cake.png), url(./images/cake.png);
  /* *If you want you can remove images and add a gradient color for background */
  /* background-image: linear-gradient(120deg, #aaa7b0, #ff002b); */
  background-color: #c88cfc;
  background-position: left top, right top;
  background-repeat: no-repeat, no-repeat;
  background-size: contain, contain;
  background-attachment: fixed;
  overflow: hidden;
  position: relative;
}

/* !You can customize wishing msg */
#msgSet {
  line-height: 1.4;
  font-size: 106%;
}

/* !You can customize wishing msg h3 tags */
#msgSet h3 {
  margin: 0px 0;
  font-family: cursive;
  font-weight: normal;
}

/* *Play Button */
#playButton {
  z-index: 6;
  color: #ffd4f7;
  background: linear-gradient(to bottom, rgba(255, 0, 230, 0.627), rgb(255, 0, 106));
}

#playButton:hover {
  cursor: pointer;
  color: #d8ffd4;
  background: green;
}

/* *Rectangle Layer */
#bgImg {
  background: linear-gradient(to bottom, rgb(86, 204, 255), #fefefe78);
  width: 32.5%;
  min-width: 250px;
  height: 25%;
  margin: auto;
  padding: 10px;
  border-radius: 25px;
  z-index: 3;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.461);
  backdrop-filter: blur(2px);
}

/* *Whole page(main div tag) */
#main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  margin-top: 20px;
}

/* *Main div tag of candles */
#image-container {
  display: flex;
  justify-content: center;
  align-items: top;
  max-width: 100%;
  margin: 0 auto;
}

/* *Adjust the spacing between the candles */
#image-container div {
  margin: 0 10px;
}

/* !Instruction text */
#birthday-message {
  margin: 5px 0;
  font-size: 24px;
  color: #000000;
  max-width: 100%;
  text-align: center;
}

/* *Volume display(only need for the debugging) */
#volume-display {
  margin-top: 10px;
  font-size: 18px;
  color: #555;
}

/* !Scale up the main photo on hover */
#img-after:hover #photo {
  transform: scale(1.1);
  margin: 0px auto;
  border-radius: 25px;
}

#img-after {
  width: 270px;
  height: auto;
  overflow: hidden;
  border-radius: 25px;
  margin: 0px auto;
  box-shadow: 0 0 20px #ffffffb1;
}

/* !Main photo */
#photo {
  border-radius: 25px;
  display: none;
  width: 100%;
  height: auto;
  transition: opacity 1s ease;
  transition: transform 0.5s ease;
  margin: 0px auto;
}

/* !Separate controlling for candles */
#candle1 {
  display: block;
}

#candle2 {
  display: none;
}

#candle3 {
  display: none;
}

#candle4 {
  display: none;
}

/* *Falling dots */
.confetti {
  position: absolute;
  width: 10px;
  height: 10px;
  background-color: #6636c5;
  border-radius: 50%;
  animation: confetti-animation 3s infinite;
  z-index: 1;
  opacity: 0.4;
}

/* *Falling dots animation */
@keyframes confetti-animation {
  0% {
    transform: translateY(0) rotate(0);
  }

  100% {
    transform: translateY(600px) rotate(360deg);
  }
}

.rotating-image {
  position: absolute;
  z-index: 2;
  opacity: 0.9;
}

@keyframes float {
  0% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-20px);
  }

  100% {
    transform: translateY(0);
  }
}