div {
  border: solid 1px black;
  padding: 5px;
  text-align: center;
  /* display: table; */
  /* display: inline-block; */
}
div:before {
  content: "Added BEFORE anything within the div! ";
  color: red;
}
div:after {
  content: "Added AFTER anything within the div!";
  color: green;
}
/* before & :after are used to apply css properties JUST before/after the content WITHIN the matching element. */

p::before {
  content: "Read this -";
  background-color: yellow;
  color: red;
  font-weight: bold;
}
p::after {
  content: " - Remember this";
  background-color: yellow;
  color: red;
  font-weight: bold;
}
/*
  The ::before selector inserts something before the content of each selected element(s).
  The ::after selector inserts something after the content of each selected element(s).
  */
/* a:after {
  color: #9799a7;
  content: " (" attr(href) ")";
  font-size: 11px;
} */

.arrow {
  color: whitesmoke;
  text-decoration: none;
  background-color: royalblue;
  display: inline-block; /*to make 'a tag' behaving like block element*/
  height: 1.88rem;
  line-height: 1.88rem;
  /* same value line-height and height to make single text line vertically center  */
  padding: 0 0.8rem;
  margin-left: 20rem;
  position: relative;
}
.arrow::before,
.arrow::after {
  content: "";
  height: 0;
  position: absolute;
  width: 0;
}
.arrow::before {
  border-bottom: 15px solid royalblue;
  border-left: 15px solid transparent;
  border-top: 15px solid royalblue;
  left: -15px;
}
.arrow::after {
  border-bottom: 15px solid transparent;
  border-left: 15px solid royalblue;
  border-top: 15px solid transparent;
  right: -15px;
}
.arrow:hover {
  color: wheat;
  background-color: tomato;
}
.arrow:hover::before {
  border-top: 15px solid tomato;
  border-bottom: 15px solid tomato;
}
.arrow:hover::after {
  border-left: 15px solid tomato;
}