gallery.css

.gallery {
    margin: 0 auto;
    display: flex;
    flex-direction: column-reverse;
}

.gallery .slider,
.gallery a,
.gallery .magnifier-preview {
    height: 359px
}

.gallery ul,
.gallery li,
.gallery a,
.gallery img {
    margin: 0;
    padding: 0;
    border: 0;
}

.gallery .slider {
    /* float: left; */
    border: solid 1px #aaa;
    width: 100%;
    overflow: hidden;
    position: relative;
    top: 0;
    left: 0
}

.gallery ul {
    /* float: left; */
    width: 100%;
    list-style: none
}

.gallery li {
    /* float: left; */
    width: 100%;
    position: relative;
    display: block;
    top: 0;
    left: 0
}

.gallery a {
    display: block;
    /* width: 250px */
}

.gallery .magnifier-preview {
    /* float: left; */
    width: 250px;
    border: solid 1px #aaa;
    border-left: 0;
    text-align: center;
    display: inline-block;
    vertical-align: middle
}

.gallery .btn-wrapper {
    clear: both;
    overflow: hidden;
    padding: 5px 0;
    width: 250px;
    text-align: center
}

.gallery .heading {
    margin: 25px 0
}

.gallery .title {
    font-weight: bold;
    margin: 100px 0
}