header {
    text-align: center;
}
header h4 {
    color: gray;
    margin-top: 2em;
    margin-bottom: 2em;
}
.gallery .col img,.gallery .col video {
    max-width: 100%;
    max-height: 100%;
    margin-bottom: 1rem;
}
.gallery .solarium {
    margin-top: 2rem;
    margin-bottom: 4rem !important;
}
.gallery .water {
    margin-top: 4rem;
}
.gallery img, .gallery video {
    cursor: pointer;
}
.gallery img, .gallery video {
    transition: transform .2s; /* Animation */
}

.gallery video:hover,.gallery img:hover {
    position: relative;
    transform: scale(1.5); /* (150% zoom - Note: if the zoom is too large, it will go outside of the viewport) */
    z-index: 10;
}