如何在没有Javascript的情况下创建简单的浮动按钮

<button class="floating-button">按钮</button>

.floating-button {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 100px;
  height: 40px;
  background-color: #007bff;
  color: #fff;
  border: none;
  border-radius: 5px;
  text-align: center;
  line-height: 40px;
  cursor: pointer;
}