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wp-content/plugins/wp-smushit/_src/scss/accessibility/_color-accessibility.scss

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+@include body-class(true) {
+    &.sui-color-accessible {
+        .smush-final-log .smush-bulk-error-row {
+            box-shadow: inset 2px 0 0 0 $accessible-dark;
+            .smush-bulk-image-data:before {
+                color: $accessible-dark;
+            }
+        }
+        // Bulk Smush Fancy Tree
+        ul.fancytree-container {
+            .fancytree-selected {
+                background-color: #F8F8F8;
+                span.fancytree-checkbox {
+                    border: 1px solid $accessible-dark;
+                    background-color: $accessible-dark;
+                }
+            }
+            span.fancytree-expander:before,
+            span.fancytree-icon:before,
+            span.fancytree-title {
+                color: $accessible-dark;
+            }
+        }
+        // CDN
+        .smush-filename-extension {
+            background-color: $accessible-dark;
+        }
+        // Check images button.
+        .sui-button {
+            &.smush-button-check-success:before {
+                color: $accessible-light;
+            }
+        }
+        // Smush submit note.
+        .smush-submit-note {
+            color: $accessible-dark;
+        }
+
+        // Hightlight lazyload spinner.
+        .sui-lazyload .sui-box-selector [name="animation[spinner-icon]"]:checked+span {
+            background-color: rgba(220,220,222, 0.7)!important;
+        }
+    }
+}
+
+@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
+    .sui-wrap .sui-toggle-slider {
+        -ms-high-contrast-adjust: none;
+    }
+}