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node_modules/vant/es/overlay/index.css

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+.van-overlay{position:fixed;top:0;left:0;z-index:1;width:100%;height:100%;background-color:rgba(0,0,0,.7)}

node_modules/vant/es/overlay/index.js

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+import _mergeJSXProps from "@vue/babel-helper-vue-jsx-merge-props";
+import _extends from "@babel/runtime/helpers/esm/extends";
+// Utils
+import { createNamespace, isDef, noop } from '../utils';
+import { inherit } from '../utils/functional';
+import { preventDefault } from '../utils/dom/event'; // Types
+
+var _createNamespace = createNamespace('overlay'),
+    createComponent = _createNamespace[0],
+    bem = _createNamespace[1];
+
+function preventTouchMove(event) {
+  preventDefault(event, true);
+}
+
+function Overlay(h, props, slots, ctx) {
+  var style = _extends({
+    zIndex: props.zIndex
+  }, props.customStyle);
+
+  if (isDef(props.duration)) {
+    style.animationDuration = props.duration + "s";
+  }
+
+  return h("transition", {
+    "attrs": {
+      "name": "van-fade"
+    }
+  }, [h("div", _mergeJSXProps([{
+    "directives": [{
+      name: "show",
+      value: props.show
+    }],
+    "style": style,
+    "class": [bem(), props.className],
+    "on": {
+      "touchmove": props.lockScroll ? preventTouchMove : noop
+    }
+  }, inherit(ctx, true)]), [slots.default == null ? void 0 : slots.default()])]);
+}
+
+Overlay.props = {
+  show: Boolean,
+  zIndex: [Number, String],
+  duration: [Number, String],
+  className: null,
+  customStyle: Object,
+  lockScroll: {
+    type: Boolean,
+    default: true
+  }
+};
+export default createComponent(Overlay);

node_modules/vant/es/overlay/index.less

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+@import '../style/var';
+
+.van-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  z-index: @overlay-z-index;
+  width: 100%;
+  height: 100%;
+  background-color: @overlay-background-color;
+}

node_modules/vant/es/overlay/style/index.js

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+import '../../style/base.css';
+import '../index.css';

node_modules/vant/es/overlay/style/less.js

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+import '../../style/base.less';
+import '../index.less';