docs/python_docs/themes/mx-theme/src/scss/blockquote/_blockquote.scss

/*
 * Quotation Block Styles
 */
 .page-content {
    blockquote {
        font-size: 1rem;
        padding: 0 1rem;
        border-left: 3px solid $code_background;

        &:after {
            content: "" !important;
            margin-left: 0;
        }
        &:before {
            content: "" !important;
        }
    }
 }