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

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


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

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