If you open your browser's console while on this page, you'll notice this styled console statement:
console.log("%c💁🏻 Hello there!", "color: #8971d0; font-size: 14px; font-weight: 700; padding: 4px; border: 2px solid #8971d0;");
The first argument includes the text I want to style (preceded by the "%c" directive), and the second argument includes the actual styles. Note that the %c directive in the first argument is important, because it marks the beginning of the styled span of text.
If you want to read more about styling your console (including using build-in methods other than console.log - such as console.error or console.info), check out Mozilla's console documentation.