.pros li::marker {
  content: "+  "; /* You can replace with any symbol or emoji */
  color: green;
  font-weight: bold;
  font-size: 1.5em;
}

.cons li::marker {
  content: "-  "; /* You can replace with any symbol or emoji */
  color: firebrick;
  font-weight: bold;
  font-size: 1.7em;
}