diff --git a/ui/src/Components/Animations/MountModal/index.js b/ui/src/Components/Animations/MountModal/index.js
new file mode 100644
index 000000000..c4b2446fb
--- /dev/null
+++ b/ui/src/Components/Animations/MountModal/index.js
@@ -0,0 +1,42 @@
+import React from "react";
+import PropTypes from "prop-types";
+
+import { CSSTransition } from "react-transition-group";
+
+import "./index.scss";
+
+const MountModal = ({ children, duration, ...props }) => (
+  <CSSTransition
+    in={true}
+    classNames="components-animation-modal"
+    timeout={200}
+    appear={true}
+    enter={true}
+    exit={true}
+    {...props}
+  >
+    {children}
+  </CSSTransition>
+);
+MountModal.propTypes = {
+  children: PropTypes.node.isRequired
+};
+
+const MountModalBackdrop = ({ children, duration, ...props }) => (
+  <CSSTransition
+    in={true}
+    classNames="components-animation-backdrop"
+    timeout={200}
+    appear={true}
+    enter={true}
+    exit={true}
+    {...props}
+  >
+    {children}
+  </CSSTransition>
+);
+MountModalBackdrop.propTypes = {
+  children: PropTypes.node.isRequired
+};
+
+export { MountModal, MountModalBackdrop };
diff --git a/ui/src/Components/Animations/MountModal/index.scss b/ui/src/Components/Animations/MountModal/index.scss
new file mode 100644
index 000000000..fa9c40525
--- /dev/null
+++ b/ui/src/Components/Animations/MountModal/index.scss
@@ -0,0 +1,49 @@
+@import "~bootstrap/scss/functions";
+@import "~bootstrap/scss/variables";
+
+$duration: 0.2s;
+
+.components-animation-modal-appear,
+.components-animation-modal-enter {
+  opacity: 0.01;
+  transform: translate(0, -25%);
+}
+.components-animation-modal-appear-active,
+.components-animation-modal-enter-active {
+  opacity: 1;
+  transition: transform $duration ease-out, opacity $duration ease-in;
+  transform: translate(0, 0);
+}
+
+.components-animation-modal-exit {
+  opacity: 1;
+  transform: translate(0, 0);
+}
+.components-animation-modal-exit-active {
+  opacity: 0.01;
+  transform: translate(0, -25%);
+  transition: transform $duration ease-in, opacity $duration ease-out;
+}
+
+.components-animation-backdrop-appear,
+.components-animation-backdrop-enter {
+  opacity: 0.01;
+}
+.components-animation-backdrop-appear-active,
+.components-animation-backdrop-enter-active {
+  opacity: $modal-backdrop-opacity;
+  transition: opacity $duration ease-in;
+}
+
+.components-animation-backdrop-enter-done {
+  opacity: $modal-backdrop-opacity;
+  transition: opacity $duration ease-in;
+}
+
+.components-animation-backdrop-exit {
+  opacity: $modal-backdrop-opacity;
+}
+.components-animation-backdrop-exit-active {
+  opacity: 0.01;
+  transition: opacity $duration ease-out;
+}
diff --git a/ui/src/Components/MainModal/MainModalContent.js b/ui/src/Components/MainModal/MainModalContent.js
index 33c58d4f7..67b0d88ab 100644
--- a/ui/src/Components/MainModal/MainModalContent.js
+++ b/ui/src/Components/MainModal/MainModalContent.js
@@ -10,6 +10,7 @@ import { disableBodyScroll, enableBodyScroll } from "body-scroll-lock";
 import { AlertStore } from "Stores/AlertStore";
 import { Settings } from "Stores/Settings";
 import { Configuration } from "./Configuration";
+import { MountModalBackdrop } from "Components/Animations/MountModal";
 import { Help } from "./Help";
 
 const Tab = ({ title, active, onClick }) => (
@@ -38,7 +39,8 @@ const MainModalContent = observer(
     static propTypes = {
       alertStore: PropTypes.instanceOf(AlertStore).isRequired,
       settingsStore: PropTypes.instanceOf(Settings).isRequired,
-      onHide: PropTypes.func.isRequired
+      onHide: PropTypes.func.isRequired,
+      isVisible: PropTypes.bool.isRequired
     };
 
     tab = observable(
@@ -60,43 +62,48 @@ const MainModalContent = observer(
     }
 
     render() {
-      const { alertStore, settingsStore, onHide } = this.props;
+      const { alertStore, settingsStore, onHide, isVisible } = this.props;
 
       return ReactDOM.createPortal(
-        <div className="modal d-block bg-primary-transparent-80" role="dialog">
-          <div className="modal-dialog modal-lg" role="document">
-            <div className="modal-content">
-              <div className="modal-header py-2">
-                <nav className="nav nav-pills nav-justified w-100">
-                  <Tab
-                    title="Configuration"
-                    active={this.tab.current === TabNames.Configuration}
-                    onClick={() => this.tab.setTab(TabNames.Configuration)}
-                  />
-                  <Tab
-                    title="Help"
-                    active={this.tab.current === TabNames.Help}
-                    onClick={() => this.tab.setTab(TabNames.Help)}
-                  />
-                  <button type="button" className="close" onClick={onHide}>
-                    <span>&times;</span>
-                  </button>
-                </nav>
-              </div>
-              <div className="modal-body">
-                {this.tab.current === TabNames.Help ? <Help /> : null}
-                {this.tab.current === TabNames.Configuration ? (
-                  <Configuration settingsStore={settingsStore} />
-                ) : null}
-              </div>
-              <div className="modal-footer">
-                <span className="text-muted">
-                  Version: {alertStore.info.version}
-                </span>
+        <React.Fragment>
+          <div className="modal d-block" role="dialog">
+            <div className="modal-dialog modal-lg" role="document">
+              <div className="modal-content">
+                <div className="modal-header py-2">
+                  <nav className="nav nav-pills nav-justified w-100">
+                    <Tab
+                      title="Configuration"
+                      active={this.tab.current === TabNames.Configuration}
+                      onClick={() => this.tab.setTab(TabNames.Configuration)}
+                    />
+                    <Tab
+                      title="Help"
+                      active={this.tab.current === TabNames.Help}
+                      onClick={() => this.tab.setTab(TabNames.Help)}
+                    />
+                    <button type="button" className="close" onClick={onHide}>
+                      <span>&times;</span>
+                    </button>
+                  </nav>
+                </div>
+                <div className="modal-body">
+                  {this.tab.current === TabNames.Help ? <Help /> : null}
+                  {this.tab.current === TabNames.Configuration ? (
+                    <Configuration settingsStore={settingsStore} />
+                  ) : null}
+                </div>
+                <div className="modal-footer">
+                  <span className="text-muted">
+                    Version: {alertStore.info.version}
+                  </span>
+                </div>
               </div>
             </div>
           </div>
-        </div>,
+          <MountModalBackdrop in={isVisible} unmountOnExit>
+            <div className="modal-backdrop d-block" />
+          </MountModalBackdrop>
+        </React.Fragment>,
         document.body
       );
     }
diff --git a/ui/src/Components/MainModal/MainModalContent.test.js b/ui/src/Components/MainModal/MainModalContent.test.js
index dabf4e7c4..f9b033f4a 100644
--- a/ui/src/Components/MainModal/MainModalContent.test.js
+++ b/ui/src/Components/MainModal/MainModalContent.test.js
@@ -28,6 +28,7 @@ const FakeModal = () => {
       alertStore={alertStore}
       settingsStore={settingsStore}
       onHide={onHide}
+      isVisible={true}
     />
   );
 };
diff --git a/ui/src/Components/MainModal/__snapshots__/MainModalContent.test.js.snap b/ui/src/Components/MainModal/__snapshots__/MainModalContent.test.js.snap
index 19bf61b7c..eff9a7e04 100644
--- a/ui/src/Components/MainModal/__snapshots__/MainModalContent.test.js.snap
+++ b/ui/src/Components/MainModal/__snapshots__/MainModalContent.test.js.snap
@@ -2,7 +2,7 @@
 
 exports[`<MainModalContent /> matches snapshot 1`] = `
 "
-<div class=\\"modal d-block bg-primary-transparent-80\\"
+<div class=\\"modal d-block\\"
      role=\\"dialog\\"
 >
   <div class=\\"modal-dialog modal-lg\\"
diff --git a/ui/src/Components/MainModal/index.js b/ui/src/Components/MainModal/index.js
index 91f99b68a..150bd1db7 100644
--- a/ui/src/Components/MainModal/index.js
+++ b/ui/src/Components/MainModal/index.js
@@ -9,7 +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 { MountModal } from "Components/Animations/MountModal";
 import { MainModalContent } from "./MainModalContent";
 
 const MainModal = observer(
@@ -53,13 +53,14 @@ const MainModal = observer(
               <FontAwesomeIcon icon={faCog} />
             </span>
           </li>
-          <MountFade in={this.toggle.show} unmountOnExit>
+          <MountModal in={this.toggle.show} unmountOnExit>
             <MainModalContent
               alertStore={alertStore}
               settingsStore={settingsStore}
               onHide={this.toggle.hide}
+              isVisible={this.toggle.show}
             />
-          </MountFade>
+          </MountModal>
         </React.Fragment>
       );
     }
diff --git a/ui/src/Components/SilenceModal/SilenceModalContent.js b/ui/src/Components/SilenceModal/SilenceModalContent.js
index 6c6cbb3e1..be7109652 100644
--- a/ui/src/Components/SilenceModal/SilenceModalContent.js
+++ b/ui/src/Components/SilenceModal/SilenceModalContent.js
@@ -9,6 +9,7 @@ import { disableBodyScroll, enableBodyScroll } from "body-scroll-lock";
 import { AlertStore } from "Stores/AlertStore";
 import { SilenceFormStore } from "Stores/SilenceFormStore";
 import { Settings } from "Stores/Settings";
+import { MountModalBackdrop } from "Components/Animations/MountModal";
 import { SilenceForm } from "./SilenceForm";
 import { SilenceSubmitController } from "./SilenceSubmitController";
 
@@ -38,36 +39,44 @@ const SilenceModalContent = observer(
       } = this.props;
 
       return ReactDOM.createPortal(
-        <div className="modal d-block bg-primary-transparent-80" role="dialog">
-          <div className="modal-dialog modal-lg" role="document">
-            <div className="modal-content">
-              <div className="modal-header">
-                <h5 className="modal-title">
-                  {silenceFormStore.data.silenceID === null
-                    ? "Add new silence"
-                    : `Editing silence ${silenceFormStore.data.silenceID}`}
-                </h5>
-                <button type="button" className="close" onClick={onHide}>
-                  <span className="align-middle">&times;</span>
-                </button>
-              </div>
-              <div className="modal-body">
-                {silenceFormStore.data.inProgress ? (
-                  <SilenceSubmitController
-                    alertStore={alertStore}
-                    silenceFormStore={silenceFormStore}
-                  />
-                ) : (
-                  <SilenceForm
-                    alertStore={alertStore}
-                    silenceFormStore={silenceFormStore}
-                    settingsStore={settingsStore}
-                  />
-                )}
+        <React.Fragment>
+          <div className="modal d-block" role="dialog">
+            <div className="modal-dialog modal-lg" role="document">
+              <div className="modal-content">
+                <div className="modal-header">
+                  <h5 className="modal-title">
+                    {silenceFormStore.data.silenceID === null
+                      ? "Add new silence"
+                      : `Editing silence ${silenceFormStore.data.silenceID}`}
+                  </h5>
+                  <button type="button" className="close" onClick={onHide}>
+                    <span className="align-middle">&times;</span>
+                  </button>
+                </div>
+                <div className="modal-body">
+                  {silenceFormStore.data.inProgress ? (
+                    <SilenceSubmitController
+                      alertStore={alertStore}
+                      silenceFormStore={silenceFormStore}
+                    />
+                  ) : (
+                    <SilenceForm
+                      alertStore={alertStore}
+                      silenceFormStore={silenceFormStore}
+                      settingsStore={settingsStore}
+                    />
+                  )}
+                </div>
               </div>
             </div>
           </div>
-        </div>,
+          <MountModalBackdrop
+            in={silenceFormStore.toggle.visible}
+            unmountOnExit
+          >
+            <div className="modal-backdrop d-block" />
+          </MountModalBackdrop>
+        </React.Fragment>,
         document.body
       );
     }
diff --git a/ui/src/Components/SilenceModal/index.js b/ui/src/Components/SilenceModal/index.js
index d05e8470d..b615af585 100644
--- a/ui/src/Components/SilenceModal/index.js
+++ b/ui/src/Components/SilenceModal/index.js
@@ -9,7 +9,7 @@ import { faBellSlash } from "@fortawesome/free-solid-svg-icons/faBellSlash";
 import { AlertStore } from "Stores/AlertStore";
 import { SilenceFormStore } from "Stores/SilenceFormStore";
 import { Settings } from "Stores/Settings";
-import { MountFade } from "Components/Animations/MountFade";
+import { MountModal } from "Components/Animations/MountModal";
 import { SilenceModalContent } from "./SilenceModalContent";
 
 import "./index.css";
@@ -60,14 +60,14 @@ const SilenceModal = observer(
               <FontAwesomeIcon icon={faBellSlash} />
             </span>
           </li>
-          <MountFade in={silenceFormStore.toggle.visible} unmountOnExit>
+          <MountModal in={silenceFormStore.toggle.visible} unmountOnExit>
             <SilenceModalContent
               alertStore={alertStore}
               silenceFormStore={silenceFormStore}
               settingsStore={settingsStore}
               onHide={this.toggleModal}
             />
-          </MountFade>
+          </MountModal>
         </React.Fragment>
       );
     }