<div class="container">
  <div class="scene">
    <div class="element">
      <div class="inner">内部元素,Bottom=0, right=0</div>
    </div>
  </div>
</div>

.scroll {
  overflow auto
}

.scene {
  height 200vh
  width 200vw
  padding 10vh 10vw
  background gray
}

.container {
  width 80vw
  height 80vh
  background lightgray
  border 1px solid black
  overflow auto
}

.element {
  width 50vw
  height 50vh
  background red
  position sticky
  top 5vh
  left 5vw
  border 1px solid black
}

.inner {
  background blue
  position absolute
  right 0
  bottom 0
  color white
}
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