如何将不同大小的圆圈对齐到中间？

<div class="container">
  <div class="circle small"></div>
  <div class="circle medium"></div>
  <div class="circle large"></div>
</div>

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100vh;
}

.circle {
  border-radius: 50%;
}

.small {
  width: 50px;
  height: 50px;
  background-color: red;
}

.medium {
  width: 100px;
  height: 100px;
  background-color: green;
}

.large {
  width: 150px;
  height: 150px;
  background-color: blue;
}