body {
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  background-color: #f5f5f5;
}
#app {
  width: 100%;
  max-width: 750px;
  height: max-content;
  display: flex;
  flex-direction: column;
  background-color: #ffffff;
}
#main {
  width: 100%;
  height: 100%;
  background-color: #c72813;
}
.image {
  max-width: 100%;
  height: auto;
  margin-bottom: -10px;
}
#target {
  width: 100%;
  max-width: 750px;
  display: block;
  position: sticky;
  bottom: 0;
}
.image-container {
  position: relative;
}
.image-song {
  position: absolute;
  bottom: 10%;
  left: 5%;
  width: 30%;
  max-width: 250px;
  height: auto;
  animation: song 1s infinite;
}
@keyframes song {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}