add files

assets/js/vendor/images-compare/images-compare.css

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+/* Images compare main container */
+.images-compare-container {
+    display: inline-block;
+    position: relative;
+    overflow: hidden;
+}
+
+/* Images compare front element */
+.images-compare-before {
+    will-change: clip;
+    position: absolute;
+    top: 0;
+    left: 0;
+    z-index: 2;
+    pointer-events: none;
+    overflow: hidden;
+}
+
+/* Images compare back element */
+.images-compare-after {
+    pointer-events: none;
+}
+
+/* Responsive image settings */
+.images-compare-before img, .images-compare-after img {
+    max-width: 100%;
+    height: auto;
+    display: block;
+}
+
+/* Separator (thin vertical blank line) */
+.images-compare-separator {
+    position: absolute;
+    background: white;
+    height: 100%;
+    width: 1px;
+    z-index: 4;
+    left: 0;
+    top: 0;
+}
+
+/* Drag handle (circle) */
+.images-compare-handle {
+    height: 38px;
+    width: 38px;
+    position: absolute;
+    left: 50%;
+    top: 50%;
+    margin-left: -22px;
+    margin-top: -22px;
+    border: 3px solid white;
+    -webkit-border-radius: 1000px;
+    -moz-border-radius: 1000px;
+    border-radius: 1000px;
+    -webkit-box-shadow: 0 0 12px rgba(51, 51, 51, 0.5);
+    -moz-box-shadow: 0 0 12px rgba(51, 51, 51, 0.5);
+    box-shadow: 0 0 12px rgba(51, 51, 51, 0.5);
+    z-index: 3;
+    background: rgb(0, 0, 0);
+    background: rgba(0, 0, 0, 0.7);
+    cursor: pointer;
+}
+
+/* Drag handle arrows */
+.images-compare-left-arrow, .images-compare-right-arrow {
+    width: 0;
+    height: 0;
+    border: 6px inset transparent;
+    position: absolute;
+    top: 50%;
+    margin-top: -6px;
+}
+
+.images-compare-left-arrow {
+    border-right: 6px solid white;
+    left: 50%;
+    margin-left: -17px;
+}
+
+.images-compare-right-arrow {
+    border-left: 6px solid white;
+    right: 50%;
+    margin-right: -17px;
+}
+
+/* Label */
+.images-compare-label {
+    font-family: sans-serif;
+    text-transform: uppercase;
+    font-weight: bold;
+    position: absolute;
+    top: 10px;
+    left: 10px;
+    z-index: 1;
+    color: rgb(0, 0, 0);
+    color: rgba(0, 0, 0, 0.4);
+    background: rgb(255, 255, 255);
+    background: rgba(255, 255, 255, 0.7);
+    padding: 10px;
+    border-radius: 5px;
+    pointer-events: none;
+    display: none;
+}
+
+.images-compare-container .images-compare-label {
+    display: inherit;
+}
+
+.images-compare-before .images-compare-label {
+    left: 10px;
+}
+
+.images-compare-after .images-compare-label {
+    left: auto;
+    right: 10px;
+}