* {
  font-family: arial;
}

h2 {
  text-align: center;
}

#paragraph::first-letter {
  color:lightgreen;
  font-size: 50px;
  text-shadow: 1px 1px 3px grey;
}

#paragraph::first-line {
  color: blue;
}

::selection {
  background-color:red;
  color:white;
}


.plus::after {
  content: " +"
}

.plus::before {
  content: " -";
}