Flyout with triangle on top

index.html

<div class="flyout">Box. Lorem ipsum dolor sit met, consect etur dip * isicing elit, sed do eus mod * temp or incididunt ut labore et dolore magna aliqua.</div>

style.css

.flyout {
  position: relative;
  margin: 2em;
  border: 1px solid red;
  width: 280px;
  padding: 0.6em;
}
.flyout:before {
  content: '';
  display: block;
  height: 0;
  border: 10px solid transparent;
  border-bottom-color: red;
  position: absolute;
  top: -20px;
}