*{
    font-family: Arial;
}

h2{
    text-align: center;
}


p, button{
    color: red;
}

#outerDiv p {
    color: blue;
}



#innerDiv > p {
    color: green;
}

h3 + p {
    color: blue;
    text-decoration: underline;
}


p ~ h4{
    color: orangered;
}