body {
  margin: 0;
  padding: 0;
  background: #eee;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.loader {
  width: 60px;
  height: 60px;
  background: red;
  display: flex;
  justify-content: space-around;
  align-items: flex-end;
  padding: 10px;
  box-sizing: border-box;
}

.bar {
  width: 10px;
  height: 30px;
  background: white;
  animation: bounce 1s infinite ease-in-out;
}

.bar1 {
  animation-delay: 0.3s;
}

.bar2 {
  animation-delay: 0.6s;
}

.bar3 {
  animation-delay: 0.9s;
}

@keyframes bounce {
  0%, 100% {
    transform: scaleY(1);
  }
  50% {
    transform: scaleY(0.4);
  }
}