CSS Basics

1, border-bottom: 1px solid orange;

2, color: green;

3, font-size: large;

4, font-family: sans-serif;

5, margin: 0 12px;

6, In CSS, an em unit is equal to the computed font-size for the element to which the em is applied. ... If no font size is defined anywhere in the CSS, the em unit will be equal to the browser's default font size for the document, which is usually 16px.

7, color: orange !important;