diff --git a/quickstep/res/values/dimens.xml b/quickstep/res/values/dimens.xml
index 0199cd9..9e4d60c 100644
--- a/quickstep/res/values/dimens.xml
+++ b/quickstep/res/values/dimens.xml
@@ -48,4 +48,7 @@
 
     <!-- Width of the space behind the last task in Overview. In the center of it, there is "Clear all" button. -->
     <dimen name="clear_all_container_width">168dp</dimen>
+
+    <dimen name="shelf_surface_radius">16dp</dimen>
+    <dimen name="shelf_surface_top_padding">4dp</dimen>
 </resources>
diff --git a/quickstep/src/com/android/launcher3/uioverrides/AllAppsScrim.java b/quickstep/src/com/android/launcher3/uioverrides/AllAppsScrim.java
new file mode 100644
index 0000000..3c741b3
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/uioverrides/AllAppsScrim.java
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.uioverrides;
+
+import static com.android.launcher3.anim.Interpolators.ACCEL_2;
+import static com.android.launcher3.anim.Interpolators.DEACCEL_2;
+
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.support.v4.graphics.ColorUtils;
+
+import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.R;
+import com.android.launcher3.Utilities;
+import com.android.launcher3.allapps.AllAppsContainerView;
+import com.android.launcher3.graphics.ViewScrim;
+import com.android.launcher3.util.Themes;
+
+/**
+ * Scrim used for all-apps and shelf in Overview
+ * In transposed layout, it behaves as a simple color scrim.
+ * In portrait layout, it draws a rounded rect such that
+ *    From normal state to overview state, the shelf just fades in and does not move
+ *    From overview state to all-apps state the self moves up and fades in to cover the screen
+ */
+public class AllAppsScrim extends ViewScrim<AllAppsContainerView> {
+
+    private static final int THRESHOLD_ALPHA_DARK = 102;
+    private static final int THRESHOLD_ALPHA_LIGHT = 46;
+
+    private final Launcher mLauncher;
+    private final int mEndColor;
+
+    private int mProgressColor;
+
+    // In transposed layout, we simply draw a flat color.
+    private boolean mDrawingFlatColor;
+
+    private final Paint mVerticalPaint;
+    private float mVerticalProgress;
+
+    private final int mEndAlpha;
+    private final int mThresholdAlpha;
+    private final float mRadius;
+    private final float mTopPadding;
+
+    // Max vertical progress after which the scrim stops moving.
+    private float mMoveThreshold;
+    // Minimum visible size of the scrim.
+    private int mMinSize;
+    private float mDrawFactor = 0;
+
+    public AllAppsScrim(AllAppsContainerView view) {
+        super(view);
+        mLauncher = Launcher.getLauncher(view.getContext());
+        mEndColor = Themes.getAttrColor(mLauncher, R.attr.allAppsScrimColor);
+        mProgressColor = mEndColor;
+
+        mEndAlpha = Color.alpha(mEndColor);
+        mThresholdAlpha = Themes.getAttrBoolean(mLauncher, R.attr.isMainColorDark)
+                ? THRESHOLD_ALPHA_DARK : THRESHOLD_ALPHA_LIGHT;
+        mRadius = mLauncher.getResources().getDimension(R.dimen.shelf_surface_radius);
+        mTopPadding = mLauncher.getResources().getDimension(R.dimen.shelf_surface_top_padding);
+
+        mVerticalPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
+        mVerticalPaint.setColor(ColorUtils.setAlphaComponent(mEndColor, 255));
+
+        // Just assume the easiest UI for now, until we have the proper layout information.
+        mDrawingFlatColor = true;
+    }
+
+    @Override
+    protected void onProgressChanged() {
+        mProgressColor = ColorUtils.setAlphaComponent(mEndColor,
+                Math.round(DEACCEL_2.getInterpolation(mProgress) * Color.alpha(mEndColor)));
+    }
+
+    @Override
+    public void draw(Canvas canvas, int width, int height) {
+        if (mDrawingFlatColor) {
+            if (mProgress > 0) {
+                canvas.drawColor(mProgressColor);
+            }
+            return;
+        }
+
+        if (mVerticalPaint.getAlpha() == 0) {
+            return;
+        } else if (mDrawFactor <= 0) {
+            canvas.drawPaint(mVerticalPaint);
+        } else {
+            float top = (height - mMinSize) * mDrawFactor - mTopPadding;
+            canvas.drawRoundRect(0, top - mRadius, width, height + mRadius,
+                    mRadius, mRadius, mVerticalPaint);
+        }
+    }
+
+    public void reInitUi() {
+        DeviceProfile dp = mLauncher.getDeviceProfile();
+        mDrawingFlatColor = dp.isVerticalBarLayout();
+
+        if (!mDrawingFlatColor) {
+            float swipeLength = OverviewState.getDefaultSwipeHeight(mLauncher);
+            mMoveThreshold = 1 - swipeLength / mLauncher.getAllAppsController().getShiftRange();
+            mMinSize = dp.hotseatBarSizePx + dp.getInsets().bottom;
+            onVerticalProgress(mVerticalProgress);
+        }
+        invalidate();
+    }
+
+    public void onVerticalProgress(float progress) {
+        mVerticalProgress = progress;
+        if (mDrawingFlatColor) {
+            return;
+        }
+
+        float drawFactor;
+        int alpha;
+        if (mVerticalProgress >= mMoveThreshold) {
+            drawFactor = 1;
+            alpha = mVerticalProgress >= 1 ? 0 : Math.round(mThresholdAlpha
+                    * ACCEL_2.getInterpolation((1 - mVerticalProgress) / (1 - mMoveThreshold)));
+        } else if (mVerticalProgress <= 0) {
+            drawFactor = 0;
+            alpha = mEndAlpha;
+        } else {
+            drawFactor = mVerticalProgress / mMoveThreshold;
+            alpha = mEndAlpha - Math.round((mEndAlpha - mThresholdAlpha) * drawFactor);
+        }
+        alpha = Utilities.boundToRange(alpha, 0, 255);
+        if (alpha != mVerticalPaint.getAlpha() || drawFactor != mDrawFactor) {
+            mVerticalPaint.setAlpha(alpha);
+            mDrawFactor = drawFactor;
+            invalidate();
+        }
+    }
+
+}
diff --git a/quickstep/src/com/android/quickstep/util/LayoutUtils.java b/quickstep/src/com/android/quickstep/util/LayoutUtils.java
index aeaebea..b1fa5e2 100644
--- a/quickstep/src/com/android/quickstep/util/LayoutUtils.java
+++ b/quickstep/src/com/android/quickstep/util/LayoutUtils.java
@@ -38,7 +38,14 @@
     private @interface MultiWindowStrategy {}
 
     public static void calculateLauncherTaskSize(Context context, DeviceProfile dp, Rect outRect) {
-        float extraSpace = dp.isVerticalBarLayout() ? 0 : dp.hotseatBarSizePx;
+        float extraSpace;
+        if (dp.isVerticalBarLayout()) {
+            extraSpace = 0;
+        } else {
+            Resources res = context.getResources();
+            extraSpace = dp.hotseatBarSizePx + res.getDimension(R.dimen.shelf_surface_top_padding)
+                    + res.getDimension(R.dimen.shelf_surface_radius);
+        }
         calculateTaskSize(context, dp, extraSpace, MULTI_WINDOW_STRATEGY_HALF_SCREEN, outRect);
     }
 
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 38b5dae..8526d7c 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -28,7 +28,7 @@
     </style>
 
     <style name="BaseLauncherThemeWithCustomAttrs" parent="@style/BaseLauncherTheme">
-        <item name="allAppsScrimColor">#CCFFFFFF</item>
+        <item name="allAppsScrimColor">#EAFFFFFF</item>
         <item name="allAppsNavBarScrimColor">#66FFFFFF</item>
         <item name="popupColorPrimary">#FFF</item>
         <item name="popupColorSecondary">#F5F5F5</item> <!-- Gray 100 -->
@@ -61,7 +61,7 @@
         <item name="android:textColorHint">#A0FFFFFF</item>
         <item name="android:colorControlHighlight">#A0FFFFFF</item>
         <item name="android:colorPrimary">#FF333333</item>
-        <item name="allAppsScrimColor">#7A212121</item>
+        <item name="allAppsScrimColor">#EA212121</item>
         <item name="allAppsNavBarScrimColor">#80000000</item>
         <item name="popupColorPrimary">?android:attr/colorPrimary</item>
         <item name="popupColorSecondary">#424242</item> <!-- Gray 800 -->
diff --git a/src/com/android/launcher3/allapps/AllAppsContainerView.java b/src/com/android/launcher3/allapps/AllAppsContainerView.java
index ae41794..37405db 100644
--- a/src/com/android/launcher3/allapps/AllAppsContainerView.java
+++ b/src/com/android/launcher3/allapps/AllAppsContainerView.java
@@ -15,8 +15,6 @@
  */
 package com.android.launcher3.allapps;
 
-import static com.android.launcher3.anim.Interpolators.DEACCEL_2;
-
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Paint;
@@ -48,7 +46,7 @@
 import com.android.launcher3.Launcher;
 import com.android.launcher3.R;
 import com.android.launcher3.config.FeatureFlags;
-import com.android.launcher3.graphics.ColorScrim;
+import com.android.launcher3.uioverrides.AllAppsScrim;
 import com.android.launcher3.keyboard.FocusedItemDecorator;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
 import com.android.launcher3.util.ItemInfoMatcher;
@@ -112,8 +110,7 @@
         mAllAppsStore.addUpdateListener(this::onAppsUpdated);
 
         // Attach a scrim to be drawn behind all-apps and hotseat
-        new ColorScrim(this, Themes.getAttrColor(context, R.attr.allAppsScrimColor), DEACCEL_2)
-                .attach();
+        new AllAppsScrim(this).attach();
 
         addSpringView(R.id.all_apps_header);
         addSpringView(R.id.apps_list_view);
diff --git a/src/com/android/launcher3/allapps/AllAppsTransitionController.java b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
index ed9873e..6a0e1cc 100644
--- a/src/com/android/launcher3/allapps/AllAppsTransitionController.java
+++ b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
@@ -26,6 +26,8 @@
 import com.android.launcher3.anim.AnimationSuccessListener;
 import com.android.launcher3.anim.AnimatorSetBuilder;
 import com.android.launcher3.anim.PropertySetter;
+import com.android.launcher3.uioverrides.AllAppsScrim;
+import com.android.launcher3.graphics.ViewScrim;
 import com.android.launcher3.util.Themes;
 
 /**
@@ -55,6 +57,7 @@
     };
 
     private AllAppsContainerView mAppsView;
+    private AllAppsScrim mAllAppsScrim;
 
     private final Launcher mLauncher;
     private final boolean mIsDarkTheme;
@@ -114,6 +117,7 @@
      */
     public void setProgress(float progress) {
         mProgress = progress;
+        mAllAppsScrim.onVerticalProgress(progress);
         float shiftCurrent = progress * mShiftRange;
 
         mAppsView.setTranslationY(shiftCurrent);
@@ -205,6 +209,8 @@
 
     public void setupViews(AllAppsContainerView appsView) {
         mAppsView = appsView;
+        mAllAppsScrim = (AllAppsScrim) ViewScrim.get(mAppsView);
+        mAllAppsScrim.reInitUi();
     }
 
     /**
@@ -213,6 +219,10 @@
     public void setScrollRangeDelta(float delta) {
         mScrollRangeDelta = delta;
         mShiftRange = mLauncher.getDeviceProfile().heightPx - mScrollRangeDelta;
+
+        if (mAllAppsScrim != null) {
+            mAllAppsScrim.reInitUi();
+        }
     }
 
     /**
diff --git a/src_ui_overrides/com/android/launcher3/uioverrides/AllAppsScrim.java b/src_ui_overrides/com/android/launcher3/uioverrides/AllAppsScrim.java
new file mode 100644
index 0000000..e970c5b
--- /dev/null
+++ b/src_ui_overrides/com/android/launcher3/uioverrides/AllAppsScrim.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.uioverrides;
+
+import static com.android.launcher3.anim.Interpolators.ACCEL_1_5;
+
+import com.android.launcher3.R;
+import com.android.launcher3.allapps.AllAppsContainerView;
+import com.android.launcher3.graphics.ColorScrim;
+import com.android.launcher3.util.Themes;
+
+public class AllAppsScrim extends ColorScrim {
+
+    public AllAppsScrim(AllAppsContainerView view) {
+        super(view, Themes.getAttrColor(view.getContext(), R.attr.allAppsScrimColor), ACCEL_1_5);
+    }
+
+    public void reInitUi() {
+        // No op
+    }
+
+    public void onVerticalProgress(float progress) {
+        // No op
+    }
+}