.is-hidden
{
    display: none;
}

.gallery .btn {
    text-transform: uppercase;
    color: #efefef;
    background-color: #333;
    padding: 0.313em 0.625em; /* 5 10 */
}

.gallery .btn:hover,
.gallery .btn:focus	{ background-color: #c00; }
.gallery .btn:active	{ background-color: #a00; }

/* ARROWS */

.imagelightbox-arrow
{
    width: 3.75em; /* 60 */
    height: 7.5em; /* 120 */
    background-color: #444;
    background-color: rgba( 0, 0, 0, .5 );
    vertical-align: middle;
    display: none;
    position: fixed;
    z-index: 10001;
    top: 50%;
    margin-top: -3.75em; /* 60 */
}
.imagelightbox-arrow:hover,
.imagelightbox-arrow:focus	{ background-color: rgba( 0, 0, 0, .75 ); }
.imagelightbox-arrow:active { background-color: #111; }

.imagelightbox-arrow-left	{ left: 2.5em; /* 40 */ }
.imagelightbox-arrow-right	{ right: 2.5em; /* 40 */ }

.imagelightbox-arrow:before
{
    width: 0;
    height: 0;
    border: 1em solid transparent;
    content: '';
    display: inline-block;
    margin-bottom: -0.125em; /* 2 */
}
.imagelightbox-arrow-left:before
{
    border-left: none;
    border-right-color: #fff;
    margin-left: -0.313em; /* 5 */
}
.imagelightbox-arrow-right:before
{
    border-right: none;
    border-left-color: #fff;
    margin-right: -0.313em; /* 5 */
}

#imagelightbox-loading,
#imagelightbox-overlay,
#imagelightbox-close,
#imagelightbox-caption,
#imagelightbox-nav,
.imagelightbox-arrow
{
    -webkit-animation: fade-in .25s linear;
    animation: fade-in .25s linear;
}
@-webkit-keyframes fade-in
{
    from	{ opacity: 0; }
    to		{ opacity: 1; }
}
@keyframes fade-in
{
    from	{ opacity: 0; }
    to		{ opacity: 1; }
}

@media only screen and (max-width: 41.250em) /* 660 */
{
    #container
    {
        width: 100%;
    }
    #imagelightbox-close
    {
        top: 1.25em; /* 20 */
        right: 1.25em; /* 20 */
    }
    #imagelightbox-nav
    {
        bottom: 1.25em; /* 20 */
    }

    .imagelightbox-arrow
    {
        width: 2.5em; /* 40 */
        height: 3.75em; /* 60 */
        margin-top: -2.75em; /* 30 */
    }
    .imagelightbox-arrow-left	{ left: 1.25em; /* 20 */ }
    .imagelightbox-arrow-right	{ right: 1.25em; /* 20 */ }
}

@media only screen and (max-width: 20em) /* 320 */
{
    .imagelightbox-arrow-left	{ left: 0; }
    .imagelightbox-arrow-right	{ right: 0; }
}

/* OVERLAY */

#imagelightbox-overlay
{
    background-color: rgba(21, 21, 21, 0.9);
    position: fixed;
    z-index: 9998;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}