body {
color: white;
background: #FF66f0;
}
h1 {
color: #0000ff;
padding: 5px;
}
h2 {
background: #E6E6FF;
color: #ff0000;
padding: 5px;
}
.formula {
text-align: center;
font-style: italic;
font-weight: bold;
color: #0000ff;
}
p.definition {
border: 3px solid green;
padding: 10px;
}