.prefix-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: bold;
    text-transform: uppercase;
    color: #fff;
    margin-right: 5px;
}

.prefix-selling { background-color: #28a745; }     /* Green */
.prefix-buying { background-color: #007bff; }      /* Blue */
.prefix-looking { background-color: #ffc107; color: #000; }  /* Yellow */
.prefix-offering { background-color: #6f42c1; }     /* Purple */