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How To Use (code in header.php):

 <?php if (function_exists('byrev_horizontal_full_cat')) 
byrev_horizontal_full_cat();?>

This is css style. If you want to customize disable "Use Default CSS" from page config and define your own code.

.byrev_cat_h {background-color:rgba(255, 255, 255, 0.7); padding: 5px 10px 5px 5px;
    border: 1px solid #ffdddd; margin: 0px auto;}
    .cat0 { float: left; width: 100%; margin: 3px; background-color:rgba(255, 240, 240, 0.7);
    font-family: Arial; text-transform: capitalize; font-weight: bold; font-size: 13px;
    border-bottom: 1px dotted #ffcccc; }
    .cat0 a { text-decoration: none; }
    .cat0 span { width: 100px; display: inline-block; }
    .cat0 span a { color: #7700ff; }
    .catx { font-size: 12px; font-family: Courier New, Georgia, Verdana;
    text-decoration: none; color: #ff7700;}
    .cat0 a:hover { text-decoration: overline underline; }