<div dir="ltr" class="outer">
  <div class="inner"></div>
</div>

<div dir="rtl" class="outer">
  <div class="inner"></div>
</div>

<div class="outer vertical-lr">
  <div class="inner"></div>
</div>

<div class="outer vertical-rl">
  <div class="inner"></div>
</div>
.outer {
  border: solid 4px black;
  block-size: 100px;
  inline-size: 100px;
  position: relative;
}

.inner {
  block-size: 20px;
  inline-size: 20px;
  background-color: #4A90E2;
  position: absolute;
  inset-block-end: 4px;
  inset-inline-end: 20px;
}

.vertical-rl {
  writing-mode: vertical-rl;
}

.vertical-lr {
  writing-mode: vertical-lr;
}

body {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 16px;
}
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