angular-cn/aio/src/styles/2-modules/_code.scss

.code-example {
    @include codeblock($backgroundgray);
    color: $darkgray;
}

.code-shell code {
    @include codeblock($darkgray);
    color: $codegreen;
}

.code-example pre, code-example pre {
    margin: 0px;
    padding: 0px;
    white-space: pre-wrap;
}