.buttons-bar {
  display: none;
  margin-top: 10px;
}
.buttons-bar button {
  margin-right: 5px;
}
.buttons-bar.show {
  display: block;
  opacity: 1;
  animation-name: fadeInOpacity;
  animation-iteration-count: 1;
  animation-timing-function: ease-in;
  animation-duration: 1s;
}

@keyframes fadeInOpacity {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}