preview-code.css

.markdown-preview-view pre, .cm-s-obsidian .HyperMD-codeblock .cm-hmd-codeblock {
    border: none;
    /* smaller-font code blocks*/
    font-size: 85% !important;
}
.theme-light .token.entity {
    /* fix highlighting bug (?) */
    background: none;
}
.markdown-preview-view code {
    /* don't word-wrap */
    white-space: pre !important;
}