.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    padding: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.cert-item {
    position: relative;
    text-align: center;
}

/* Hide images by default */
.cert-img {
    display: none;
    position: absolute;
    top: 100%;           /* position below the title */
    left: 50%;
    transform: translateX(-50%);
    width: 200px;        /* adjust size */
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    z-index: 10;
}

/* Show image on hover over title */
.cert-name:hover + .cert-img {
    display: block;
}

.filter-buttons {
    text-align: center;
    margin: 1rem 0;
}

.filter-buttons button {
    margin: 0 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 5px;
    background-color: #296890;
    color: white;
    cursor: pointer;
}

.filter-buttons button:hover {
    background-color: #388AA5;
}

.cert-name a {
  text-decoration: none; 
  color: inherit;        
}