如何在div的右上角添加圆并显示带有文本溢出的省略号

<div class="container">
  <div class="content">这是一段很长的文本，超出容器宽度时将显示省略号。</div>
</div>

.container {
  position: relative;
  width: 200px;
  height: 200px;
  border: 1px solid #ccc;
  overflow: hidden;
}

.content {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  padding: 10px;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

.container::before {
  content: "";
  position: absolute;
  top: 10px;
  right: 10px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: red;
}