* {
    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: " -"
}