diff --git a/ui/src/Components/Animations/DropdownSlide/index.css b/ui/src/Components/Animations/DropdownSlide/index.css
new file mode 100644
index 000000000..14180e18f
--- /dev/null
+++ b/ui/src/Components/Animations/DropdownSlide/index.css
@@ -0,0 +1,33 @@
+.components-animation-slide-enter,
+.components-animation-slide-appear {
+  opacity: 0.01;
+  overflow: hidden;
+  max-height: 0px;
+  border: 0;
+  padding: 0;
+  margin: 0;
+}
+.components-animation-slide-enter-active,
+.components-animation-slide-appear-active {
+  max-height: 500px; /* can't use auto here */
+  opacity: 1;
+  transition-property: max-height, opacity;
+  transition-duration: 0.15s;
+  transition-timing-function: ease-out;
+}
+
+.components-animation-slide-exit {
+  max-height: 500px; /* can't use auto here */
+  opacity: 1;
+}
+.components-animation-slide-exit-active {
+  opacity: 0.01;
+  overflow: hidden;
+  max-height: 0px;
+  border: 0;
+  padding: 0;
+  margin: 0;
+  transition-property: max-height, opacity;
+  transition-duration: 0.15s;
+  transition-timing-function: ease-out;
+}
diff --git a/ui/src/Components/Animations/DropdownSlide/index.js b/ui/src/Components/Animations/DropdownSlide/index.js
new file mode 100644
index 000000000..549b849af
--- /dev/null
+++ b/ui/src/Components/Animations/DropdownSlide/index.js
@@ -0,0 +1,24 @@
+import React from "react";
+import PropTypes from "prop-types";
+
+import { CSSTransition } from "react-transition-group";
+
+import "./index.css";
+
+const DropdownSlide = ({ children, duration, ...props }) => (
+  <CSSTransition
+    in={true}
+    classNames="components-animation-slide"
+    timeout={150}
+    appear={true}
+    exit={true}
+    {...props}
+  >
+    {children}
+  </CSSTransition>
+);
+DropdownSlide.propTypes = {
+  children: PropTypes.node.isRequired
+};
+
+export { DropdownSlide };
diff --git a/ui/src/Components/Animations/MountFade/index.css b/ui/src/Components/Animations/MountFade/index.css
new file mode 100644
index 000000000..61752ab91
--- /dev/null
+++ b/ui/src/Components/Animations/MountFade/index.css
@@ -0,0 +1,23 @@
+.components-animation-fade-appear {
+  opacity: 0.01;
+}
+.components-animation-fade-appear-active {
+  opacity: 1;
+  transition: opacity 0.15s ease-in;
+}
+
+.components-animation-fade-enter {
+  opacity: 0.01;
+}
+.components-animation-fade-enter-active {
+  opacity: 1;
+  transition: opacity 0.15s ease-in;
+}
+
+.components-animation-fade-exit {
+  opacity: 1;
+}
+.components-animation-fade-exit-active {
+  opacity: 0.01;
+  transition: opacity 0.15s ease-in;
+}
diff --git a/ui/src/Components/Animations/MountFade/index.js b/ui/src/Components/Animations/MountFade/index.js
new file mode 100644
index 000000000..7e46b21c6
--- /dev/null
+++ b/ui/src/Components/Animations/MountFade/index.js
@@ -0,0 +1,25 @@
+import React from "react";
+import PropTypes from "prop-types";
+
+import { CSSTransition } from "react-transition-group";
+
+import "./index.css";
+
+const MountFade = ({ children, duration, ...props }) => (
+  <CSSTransition
+    in={true}
+    classNames="components-animation-fade"
+    timeout={150}
+    appear={true}
+    enter={true}
+    exit={true}
+    {...props}
+  >
+    {children}
+  </CSSTransition>
+);
+MountFade.propTypes = {
+  children: PropTypes.node.isRequired
+};
+
+export { MountFade };
diff --git a/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/AlertMenu.js b/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/AlertMenu.js
index 4e521bc85..68bbe5832 100644
--- a/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/AlertMenu.js
+++ b/ui/src/Components/Grid/AlertGrid/AlertGroup/Alert/AlertMenu.js
@@ -16,6 +16,7 @@ import { faCaretDown } from "@fortawesome/free-solid-svg-icons/faCaretDown";
 import { faBellSlash } from "@fortawesome/free-solid-svg-icons/faBellSlash";
 
 import { FetchPauser } from "Components/FetchPauser";
+import { DropdownSlide } from "Components/Animations/DropdownSlide";
 
 const onSilenceClick = (silenceFormStore, group, alert) => {
   silenceFormStore.data.resetProgress();
@@ -127,7 +128,7 @@ const AlertMenu = observer(
               </span>
             )}
           </Reference>
-          {this.collapse.value ? null : (
+          <DropdownSlide in={!this.collapse.value} unmountOnExit>
             <Popper
               placement="bottom-start"
               modifiers={{
@@ -149,7 +150,7 @@ const AlertMenu = observer(
                 />
               )}
             </Popper>
-          )}
+          </DropdownSlide>
         </Manager>
       );
     }
diff --git a/ui/src/Components/Grid/AlertGrid/AlertGroup/GroupHeader/GroupMenu.js b/ui/src/Components/Grid/AlertGrid/AlertGroup/GroupHeader/GroupMenu.js
index 81244998c..57492a20e 100644
--- a/ui/src/Components/Grid/AlertGrid/AlertGroup/GroupHeader/GroupMenu.js
+++ b/ui/src/Components/Grid/AlertGrid/AlertGroup/GroupHeader/GroupMenu.js
@@ -16,6 +16,7 @@ import { faBellSlash } from "@fortawesome/free-solid-svg-icons/faBellSlash";
 
 import { FormatAPIFilterQuery } from "Stores/AlertStore";
 import { QueryOperators, StaticLabels, FormatQuery } from "Common/Query";
+import { DropdownSlide } from "Components/Animations/DropdownSlide";
 import { FetchPauser } from "Components/FetchPauser";
 
 const onSilenceClick = (silenceFormStore, group) => {
@@ -123,7 +124,7 @@ const GroupMenu = observer(
               </a>
             )}
           </Reference>
-          {this.collapse.value ? null : (
+          <DropdownSlide in={!this.collapse.value} unmountOnExit>
             <Popper
               placement="bottom-start"
               modifiers={{
@@ -146,7 +147,7 @@ const GroupMenu = observer(
                 />
               )}
             </Popper>
-          )}
+          </DropdownSlide>
         </Manager>
       );
     }
diff --git a/ui/src/Components/Grid/AlertGrid/AlertGroup/index.css b/ui/src/Components/Grid/AlertGrid/AlertGroup/index.css
deleted file mode 100644
index 0d46bb1de..000000000
--- a/ui/src/Components/Grid/AlertGrid/AlertGroup/index.css
+++ /dev/null
@@ -1,26 +0,0 @@
-.components-grid-alertgrid-alertgroup-fade-enter {
-  opacity: 0.01;
-}
-
-.components-grid-alertgrid-alertgroup-fade-enter-active {
-  opacity: 1;
-  transition: opacity 0.4s ease-in;
-}
-
-.components-grid-alertgrid-alertgroup-fade-exit {
-  opacity: 1;
-}
-
-.components-grid-alertgrid-alertgroup-fade-exit-active {
-  opacity: 0.01;
-  transition: opacity 0.4s ease-in;
-}
-
-.components-grid-alertgrid-alertgroup-fade-appear {
-  opacity: 0.01;
-}
-
-.components-grid-alertgrid-alertgroup-fade-appear-active {
-  opacity: 1;
-  transition: opacity 0.4s ease-in;
-}
diff --git a/ui/src/Components/Grid/AlertGrid/AlertGroup/index.js b/ui/src/Components/Grid/AlertGrid/AlertGroup/index.js
index 99e334b9f..8287590be 100644
--- a/ui/src/Components/Grid/AlertGrid/AlertGroup/index.js
+++ b/ui/src/Components/Grid/AlertGrid/AlertGroup/index.js
@@ -6,20 +6,17 @@ import { observable, action, toJS } from "mobx";
 
 import hash from "object-hash";
 
-import { CSSTransition } from "react-transition-group";
-
 import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
 import { faPlus } from "@fortawesome/free-solid-svg-icons/faPlus";
 import { faMinus } from "@fortawesome/free-solid-svg-icons/faMinus";
 
+import { MountFade } from "Components/Animations/MountFade";
 import { Settings } from "Stores/Settings";
 import { SilenceFormStore } from "Stores/SilenceFormStore";
 import { GroupHeader } from "./GroupHeader";
 import { Alert } from "./Alert";
 import { GroupFooter } from "./GroupFooter";
 
-import "./index.css";
-
 const LoadButton = ({ icon, action }) => {
   return (
     <button type="button" className="btn btn-sm py-0 bg-white" onClick={action}>
@@ -153,15 +150,7 @@ const AlertGroup = observer(
       }
 
       return (
-        <CSSTransition
-          key={group.id}
-          in={true}
-          classNames="components-grid-alertgrid-alertgroup-fade"
-          timeout={400}
-          appear={true}
-          enter={true}
-          exit={true}
-        >
+        <MountFade>
           <div className="components-grid-alertgrid-alertgroup p-1">
             <div className="card">
               <div
@@ -214,7 +203,7 @@ const AlertGroup = observer(
               ) : null}
             </div>
           </div>
-        </CSSTransition>
+        </MountFade>
       );
     }
   }
diff --git a/ui/src/Components/MainModal/index.js b/ui/src/Components/MainModal/index.js
index af98d9d11..dbe27f815 100644
--- a/ui/src/Components/MainModal/index.js
+++ b/ui/src/Components/MainModal/index.js
@@ -9,6 +9,7 @@ import { faCog } from "@fortawesome/free-solid-svg-icons/faCog";
 
 import { AlertStore } from "Stores/AlertStore";
 import { Settings } from "Stores/Settings";
+import { MountFade } from "Components/Animations/MountFade";
 import { MainModalContent } from "./MainModalContent";
 
 const MainModal = observer(
@@ -49,13 +50,13 @@ const MainModal = observer(
               <FontAwesomeIcon icon={faCog} />
             </a>
           </li>
-          {this.toggle.show ? (
+          <MountFade in={this.toggle.show} unmountOnExit>
             <MainModalContent
               alertStore={alertStore}
               settingsStore={settingsStore}
               onHide={this.toggle.hide}
             />
-          ) : null}
+          </MountFade>
         </React.Fragment>
       );
     }
diff --git a/ui/src/Components/MainModal/index.test.js b/ui/src/Components/MainModal/index.test.js
index fc0a699d6..daed8ce4c 100644
--- a/ui/src/Components/MainModal/index.test.js
+++ b/ui/src/Components/MainModal/index.test.js
@@ -1,6 +1,6 @@
 import React from "react";
 
-import { shallow, mount } from "enzyme";
+import { mount } from "enzyme";
 
 import { AlertStore } from "Stores/AlertStore";
 import { Settings } from "Stores/Settings";
@@ -9,17 +9,15 @@ import { MainModal } from ".";
 let alertStore;
 let settingsStore;
 
+beforeAll(() => {
+  jest.useFakeTimers();
+});
+
 beforeEach(() => {
   alertStore = new AlertStore([]);
   settingsStore = new Settings();
 });
 
-const ShallowMainModal = () => {
-  return shallow(
-    <MainModal alertStore={alertStore} settingsStore={settingsStore} />
-  );
-};
-
 const MountedMainModal = () => {
   return mount(
     <MainModal alertStore={alertStore} settingsStore={settingsStore} />
@@ -28,33 +26,46 @@ const MountedMainModal = () => {
 
 describe("<MainModal />", () => {
   it("only renders FontAwesomeIcon when modal is not shown", () => {
-    const tree = ShallowMainModal();
-    expect(tree.text()).toBe("<FontAwesomeIcon />");
+    const tree = MountedMainModal();
+    expect(tree.find("FontAwesomeIcon")).toHaveLength(1);
+    expect(tree.find("MainModalContent")).toHaveLength(0);
   });
 
   it("renders the modal when it is shown", () => {
-    const tree = ShallowMainModal();
+    const tree = MountedMainModal();
     const toggle = tree.find(".nav-link");
     toggle.simulate("click");
-    expect(tree.text()).toBe("<FontAwesomeIcon /><MainModalContent />");
+    expect(tree.find("FontAwesomeIcon")).not.toHaveLength(0);
+    expect(tree.find("MainModalContent")).toHaveLength(1);
   });
 
   it("hides the modal when toggle() is called twice", () => {
-    const tree = ShallowMainModal();
+    const tree = MountedMainModal();
     const toggle = tree.find(".nav-link");
+
     toggle.simulate("click");
+    jest.runOnlyPendingTimers();
+    tree.update();
+    expect(tree.find("MainModalContent")).toHaveLength(1);
+
     toggle.simulate("click");
-    expect(tree.text()).toBe("<FontAwesomeIcon />");
+    jest.runOnlyPendingTimers();
+    tree.update();
+    expect(tree.find("MainModalContent")).toHaveLength(0);
   });
 
   it("hides the modal when hide() is called", () => {
-    const tree = ShallowMainModal();
+    const tree = MountedMainModal();
     const toggle = tree.find(".nav-link");
+
     toggle.simulate("click");
-    expect(tree.text()).toBe("<FontAwesomeIcon /><MainModalContent />");
+    expect(tree.find("MainModalContent")).toHaveLength(1);
+
     const instance = tree.instance();
     instance.toggle.hide();
-    expect(tree.text()).toBe("<FontAwesomeIcon />");
+    jest.runOnlyPendingTimers();
+    tree.update();
+    expect(tree.find("MainModalContent")).toHaveLength(0);
   });
 
   it("'modal-open' class is appended to body node when modal is visible", () => {
diff --git a/ui/src/Components/NavBar/FilterInput/History.js b/ui/src/Components/NavBar/FilterInput/History.js
index bb5327516..03a4eb498 100644
--- a/ui/src/Components/NavBar/FilterInput/History.js
+++ b/ui/src/Components/NavBar/FilterInput/History.js
@@ -19,6 +19,7 @@ import { faTrash } from "@fortawesome/free-solid-svg-icons/faTrash";
 
 import { AlertStore } from "Stores/AlertStore";
 import { Settings } from "Stores/Settings";
+import { DropdownSlide } from "Components/Animations/DropdownSlide";
 import { HistoryLabel } from "Components/Labels/HistoryLabel";
 
 import "./History.css";
@@ -249,7 +250,7 @@ const History = observer(
               </button>
             )}
           </Reference>
-          {this.collapse.value ? null : (
+          <DropdownSlide in={!this.collapse.value} unmountOnExit>
             <Popper
               modifiers={{
                 arrow: { enabled: false }
@@ -270,7 +271,7 @@ const History = observer(
                 />
               )}
             </Popper>
-          )}
+          </DropdownSlide>
         </Manager>
       );
     }
diff --git a/ui/src/Components/SilenceModal/index.js b/ui/src/Components/SilenceModal/index.js
index 5ada556d4..b1f8b43d3 100644
--- a/ui/src/Components/SilenceModal/index.js
+++ b/ui/src/Components/SilenceModal/index.js
@@ -6,6 +6,7 @@ import { observer } from "mobx-react";
 import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
 import { faBellSlash } from "@fortawesome/free-solid-svg-icons/faBellSlash";
 
+import { MountFade } from "Components/Animations/MountFade";
 import { SilenceModalContent } from "./SilenceModalContent";
 
 import "./index.css";
@@ -53,14 +54,14 @@ const SilenceModal = observer(
               <FontAwesomeIcon icon={faBellSlash} />
             </a>
           </li>
-          {silenceFormStore.toggle.visible ? (
+          <MountFade in={silenceFormStore.toggle.visible} unmountOnExit>
             <SilenceModalContent
               alertStore={alertStore}
               silenceFormStore={silenceFormStore}
               settingsStore={settingsStore}
               onHide={this.toggleModal}
             />
-          ) : null}
+          </MountFade>
         </React.Fragment>
       );
     }
diff --git a/ui/src/Components/SilenceModal/index.test.js b/ui/src/Components/SilenceModal/index.test.js
index b1aa3d359..5205a0a67 100644
--- a/ui/src/Components/SilenceModal/index.test.js
+++ b/ui/src/Components/SilenceModal/index.test.js
@@ -1,6 +1,6 @@
 import React from "react";
 
-import { shallow, mount } from "enzyme";
+import { mount } from "enzyme";
 
 import { AlertStore } from "Stores/AlertStore";
 import { Settings } from "Stores/Settings";
@@ -12,6 +12,7 @@ let settingsStore;
 let silenceFormStore;
 
 beforeAll(() => {
+  jest.useFakeTimers();
   fetch.mockResponse(JSON.stringify([]));
 });
 
@@ -21,16 +22,6 @@ beforeEach(() => {
   silenceFormStore = new SilenceFormStore();
 });
 
-const ShallowSilenceModal = () => {
-  return shallow(
-    <SilenceModal
-      alertStore={alertStore}
-      silenceFormStore={silenceFormStore}
-      settingsStore={settingsStore}
-    />
-  );
-};
-
 const MountedSilenceModal = () => {
   return mount(
     <SilenceModal
@@ -43,32 +34,47 @@ const MountedSilenceModal = () => {
 
 describe("<SilenceModal />", () => {
   it("only renders FontAwesomeIcon when modal is not shown", () => {
-    const tree = ShallowSilenceModal();
-    expect(tree.text()).toBe("<FontAwesomeIcon />");
+    const tree = MountedSilenceModal();
+    expect(tree.find("FontAwesomeIcon")).toHaveLength(1);
+    expect(tree.find("SilenceModalContent")).toHaveLength(0);
   });
 
   it("renders the modal when it is shown", () => {
-    const tree = ShallowSilenceModal();
+    const tree = MountedSilenceModal();
     const toggle = tree.find(".nav-link");
     toggle.simulate("click");
-    expect(tree.text()).toBe("<FontAwesomeIcon /><SilenceModalContent />");
+    expect(tree.find("FontAwesomeIcon")).not.toHaveLength(0);
+    expect(tree.find("SilenceModalContent")).toHaveLength(1);
   });
 
   it("hides the modal when toggle() is called twice", () => {
-    const tree = ShallowSilenceModal();
+    const tree = MountedSilenceModal();
     const toggle = tree.find(".nav-link");
+
     toggle.simulate("click");
+    jest.runOnlyPendingTimers();
+    tree.update();
+    expect(tree.find("SilenceModalContent")).toHaveLength(1);
+
     toggle.simulate("click");
-    expect(tree.text()).toBe("<FontAwesomeIcon />");
+    jest.runOnlyPendingTimers();
+    tree.update();
+    expect(tree.find("SilenceModalContent")).toHaveLength(0);
   });
 
   it("hides the modal when hide() is called", () => {
-    const tree = ShallowSilenceModal();
+    const tree = MountedSilenceModal();
     const toggle = tree.find(".nav-link");
+
     toggle.simulate("click");
-    expect(tree.text()).toBe("<FontAwesomeIcon /><SilenceModalContent />");
+    jest.runOnlyPendingTimers();
+    tree.update();
+    expect(tree.find("SilenceModalContent")).toHaveLength(1);
+
     silenceFormStore.toggle.hide();
-    expect(tree.text()).toBe("<FontAwesomeIcon />");
+    jest.runOnlyPendingTimers();
+    tree.update();
+    expect(tree.find("SilenceModalContent")).toHaveLength(0);
   });
 
   it("'modal-open' class is appended to body node when modal is visible", () => {