.container {
  width: 90%;
  margin: 20px auto 0;
  padding: 30px 0;
}

.circles {
  width: 300px;
  margin: 0 auto;
  border-left: 5px solid #999;
  border-right: 5px solid #999;
}
.circles .circle {
  width: 50px;
  height: 50px;
  margin: 10px 0;
  border-radius: 50%;
  color: #333;
  display: flex;
  justify-content: center;
  align-items: center;
  transform: translateX(0);
}
.circles .circle.anime {
  animation-name: slide-right;
  animation-duration: 5s;
  animation-fill-mode: forwards;
}
.circles .circle.circle1 {
  background-color: skyblue;
  animation-timing-function: ease;
}
.circles .circle.circle2 {
  background-color: lightpink;
  animation-timing-function: ease-in;
}
.circles .circle.circle3 {
  background-color: lightgreen;
  animation-timing-function: ease-out;
}
.circles .circle.circle4 {
  background-color: violet;
  animation-timing-function: ease-in-out;
}
.circles .circle.circle5 {
  background-color: yellow;
  animation-timing-function: linear;
}

@keyframes slide-right {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(250px);
  }
}
.btns {
  margin-top: 30px;
  text-align: center;
}
.btns button {
  padding: 12px 24px;
  font-size: 16px;
  border: none;
  border-radius: 8px;
  background-color: #cc5252;
  color: white;
  cursor: pointer;
  transition: background-color 0.2s;
}
.btns button:hover {
  background-color: #b34747;
}
.btns button:disabled {
  background-color: #ccc;
  cursor: not-allowed;
  opacity: 0.7;
}