Reference
CSS Properties

Animation

Adds content to text elements and pseudo elements :before and :after.

The value must be a string enclosed in quotes, like "Hello world!".

.test {
  border: 1px solid black;
  padding: 12px;
  flex-direction: row;
}

.test:hover text {
  content: "Inside content!";
}

.test:before {
  content: "Before content!";
  margin-right: 10px;
}

.test:after {
  content: "After content!";
  margin-left: 10px;
}
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