div.theorem, div.proof {
    background-color: rgba(233, 236, 239, .65);
    margin-bottom: 1rem;
    padding: 0.5rem 1rem;
}

div.theorem.example {
    background-color: rgba(233, 240, 236, 0.65);
}

div.theorem.exercise {
    background-color: rgba(246, 236, 233, 0.65);
}

div.example div.sourceCode {
    background-color: rgba(233, 240, 236, 0.65);
    border: 1px solid rgba(233, 240, 233, 0.85);
}

div.exercise div.sourceCode {
    background-color: rgba(246, 236, 233, 0.65);
    border: 1px solid rgba(246, 236, 233, 0.85);
}