.central-images {
    min-height: 700px;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding-top: 60px; /* offset for fixed header */
}

.central-image {
    width: 300px;
    border-radius: 10px;
    display: block;
    transition: opacity 0.6s ease-in-out;
}