<div class="top-left fixed box"></div>

<div class="bottom-right fixed box"></div>
.box {
  width: 100px;
  height: 100px;
  background: lightskyblue;
  margin: 4px;
}

.fixed {
  position: fixed;
}

.top-left {
  top: 10px;
  left: 10px;
}

.bottom-right {
  bottom: 10px;
  right: 10px;
}

External CSS

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External JavaScript

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