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libraries/fancybox3/css/thumbs.css

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+/* Thumbs */
+
+.fancybox-thumbs {
+    background: #ddd;
+    bottom: 0;
+    display: none;
+    margin: 0;
+    -webkit-overflow-scrolling: touch;
+    -ms-overflow-style: -ms-autohiding-scrollbar;
+    padding: 2px 2px 4px 2px;
+    position: absolute;
+    right: 0;
+    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
+    top: 0;
+    width: 212px;
+    z-index: 99995;
+}
+
+.fancybox-thumbs-x {
+    overflow-x: auto;
+    overflow-y: hidden;
+}
+
+.fancybox-show-thumbs .fancybox-thumbs {
+    display: block;
+}
+
+.fancybox-show-thumbs .fancybox-inner {
+    right: 212px;
+}
+
+.fancybox-thumbs__list {
+    font-size: 0;
+    height: 100%;
+    list-style: none;
+    margin: 0;
+    overflow-x: hidden;
+    overflow-y: auto;
+    padding: 0;
+    position: absolute;
+    position: relative;
+    white-space: nowrap;
+    width: 100%;
+}
+
+.fancybox-thumbs-x .fancybox-thumbs__list {
+    overflow: hidden;
+}
+
+.fancybox-thumbs-y .fancybox-thumbs__list::-webkit-scrollbar {
+    width: 7px;
+}
+
+.fancybox-thumbs-y .fancybox-thumbs__list::-webkit-scrollbar-track {
+    background: #fff;
+    border-radius: 10px;
+    box-shadow: inset 0 0 6px rgba(0, 0, 0, .3);
+}
+
+.fancybox-thumbs-y .fancybox-thumbs__list::-webkit-scrollbar-thumb {
+    background: #2a2a2a;
+    border-radius: 10px;
+}
+
+.fancybox-thumbs__list a {
+    backface-visibility: hidden;
+    background-color: rgba(0, 0, 0, .1);
+    background-position: center center;
+    background-repeat: no-repeat;
+    background-size: cover;
+    cursor: pointer;
+    float: left;
+    height: 75px;
+    margin: 2px;
+    max-height: calc(100% - 8px);
+    max-width: calc(50% - 4px);
+    outline: none;
+    overflow: hidden;
+    padding: 0;
+    position: relative;
+    -webkit-tap-highlight-color: transparent;
+    width: 100px;
+}
+
+.fancybox-thumbs__list a::before {
+    border: 6px solid #ff5268;
+    bottom: 0;
+    content: '';
+    left: 0;
+    opacity: 0;
+    position: absolute;
+    right: 0;
+    top: 0;
+    transition: all .2s cubic-bezier(.25, .46, .45, .94);
+    z-index: 99991;
+}
+
+.fancybox-thumbs__list a:focus::before {
+    opacity: .5;
+}
+
+.fancybox-thumbs__list a.fancybox-thumbs-active::before {
+    opacity: 1;
+}
+
+/* Styling for Small-Screen Devices */
+@media all and (max-width: 576px) {
+    .fancybox-thumbs {
+        width: 110px;
+    }
+
+    .fancybox-show-thumbs .fancybox-inner {
+        right: 110px;
+    }
+
+    .fancybox-thumbs__list a {
+        max-width: calc(100% - 10px);
+    }
+}