article.category-premium,
.type-post.category-premium {
    border: 2px solid #28a745 !important;
    border-radius: 8px;
    position: relative;
}

article.category-premium::before,
.type-post.category-premium::before {
    content: "Premium";
    position: absolute;
    top: 15px;
    right: -30px;
    background-color: #28a745;
    color: #ffffff;
    padding: 5px 30px;
    font-size: 12px;
    font-weight: bold;
    text-transform: uppercase;
    transform: rotate(45deg);
    z-index: 10;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}