* {
    font-family: arial;
}

h2 {
    text-align: center;
}

/* Select Mutiple Elements By Separating Them with A Comma */
p, button {
     color: red;
}

/* Selects All Inside Of Descesant */
#outerDiv p {
    color: blue;
}

/* Selects All Inside Parent (Direct Descendant)*/
#innerDiv > p {
    color: green;
}

/* Selects All Elements Placed Immediately After An Element*/
h3 + p {
    color: blue;
    text-decoration: underline;
}

/* Selects All Elements Placed Immediately Before An Element*/
p ~ h4 {
    color: orangered;
}