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Edit File: admin-foogallery-gallery-piles.css

.foogallery-pile {
    position: relative;
    z-index: 10;
    float: left;
    margin: 10px 15px 15px 10px !important;
}

/* Image styles */
.foogallery-pile .foogallery-gallery-select {
    width: 150px;
    height: 150px;
    position: relative;
    box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.1), inset 0 0 0 1px rgba(0, 0, 0, 0.05);
    background: #eee;
    vertical-align: bottom;
    border: 8px solid #fff;
    overflow: hidden;
    cursor: pointer;
}

/* Stacks creted by the use of generated content */
.foogallery-pile:before, .foogallery-pile:after {
    content: "";
    width: 100%;
    height: 100%;
    position: absolute;
    border: 8px solid #fff;
    left: 0;
    -webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
    -moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
/* 1st element in stack (behind image) */
.foogallery-pile:before {
    top: -3px; z-index: -10;
    -webkit-transform: rotate(2deg);
    -moz-transform: rotate(2deg);
    transform: rotate(2deg);
}
/* 2nd element in stack (behind image) */
.foogallery-pile:after {
    top: -2px; z-index: -20;
    -webkit-transform: rotate(-2deg);
    -moz-transform: rotate(-2deg);
    transform: rotate(-2deg);
}

.foogallery-pile img {
    width: 150px;
}

.foogallery-pile h3 {
    background: #fff;
    position: absolute;
    display: block;
    bottom: 0px;
    padding: 5px;
    width: 100%;
    box-sizing: border-box;
    margin: 0;
    opacity: 0.8;
}

.foogallery-pile h3 span {
    display: block;
    font-size: 0.6em;
}

.foogallery-gallery-select.selected {
    border-color: #1E8CBE;
}

.foogallery-gallery-select.selected::before {
    content: "\f147" !important;
    display: inline-block !important;
    font: normal 60px/70px 'dashicons';
    position: absolute;
    color: #FFF;
    top: 40%;
    left: 50%;
    margin-left: -30px;
    margin-top: -30px;
    -webkit-font-smoothing: antialiased;
    background: #1E8CBE;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    z-index: 4;
    padding-top:0 !important;
}

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