<div class="containing-block">
  <div class="tooltip">Anchor me!</div>
  <div class="anchor">The anchor</div>
</div>

@import "https://unpkg.com/open-props/open-props.min.css";
@import "https://unpkg.com/open-props/normalize.min.css";

* {
  box-sizing: border-box;
}

body {
  font-family: "Google Sans", sans-serif;
  display: grid;
  place-items: center;
  min-height: 100vh;
  background: var(--surface-2);
  color: var(--text-1);
}

.containing-block {
  position: relative;
}
.tooltip {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  box-shadow: var(--shadow-4);
  padding: var(--size-4);
  white-space: nowrap;
  border-radius: var(--radius-2);
  font-weight: var(--font-weight-6);
  background: var(--surface-1);
  border: 1px solid var(--surface-3);
}

.anchor {
  background: var(--blue-4);
  text-align: center;
  font-weight: bold;
  border-radius: var(--radius-2);
  padding: var(--size-2);
}