css underline thickness code example

Example 1: css thinner hr

hr {
    border: none;
    height: 1px;
    /* Set the hr color */
    color: #333; /* old IE */
    background-color: #333; /* Modern Browsers */
}

Example 2: how to change the underline thickness in css

text-decoration-thickness: 3px;
text-decoration-thickness: 5%;