diff --git a/src/components/Post.tsx b/src/components/Post.tsx
index 77092a9..2fce4f5 100644
--- a/src/components/Post.tsx
+++ b/src/components/Post.tsx
@@ -21,7 +21,7 @@ const Post: Component<PostProps> = (props) => {
   const { overflow, elementRef } = useDetectOverflow();
   const formatDate = useFormatDate();
 
-  const [showOverflow, setShowOverflow] = createSignal();
+  const [showOverflow, setShowOverflow] = createSignal(false);
   const createdAt = () => formatDate(props.createdAt);
   const createdAtFull = () => props.createdAt.toLocaleString();
 
@@ -88,7 +88,7 @@ const Post: Component<PostProps> = (props) => {
           <div
             ref={elementRef}
             class="overflow-hidden"
-            classList={{ 'max-h-screen': !showOverflow() }}
+            classList={{ 'max-h-screen': !showOverflow(), 'max-h-none': showOverflow() }}
           >
             {props.content}
           </div>
diff --git a/src/hooks/useDetectOverflow.ts b/src/hooks/useDetectOverflow.ts
index d758208..57a1605 100644
--- a/src/hooks/useDetectOverflow.ts
+++ b/src/hooks/useDetectOverflow.ts
@@ -1,8 +1,16 @@
 import { createSignal, onMount, onCleanup } from 'solid-js';
 
+import throttle from 'lodash/throttle';
+
 // TODO Find a better way to solve this. Firefox on Windows can cause 2px gap.
 const Offset = 2;
 
+const ThrottleWaitMs = 200;
+
+/**
+ * Detect overflow if the height of the target element content is bigger than
+ * actual displayed height or window height.
+ */
 const useDetectOverflow = () => {
   let elementRef: HTMLElement | undefined;
   const [overflow, setOverflow] = createSignal(false);
@@ -11,11 +19,14 @@ const useDetectOverflow = () => {
     elementRef = el;
   };
 
-  const detectOverflow = () => {
+  const detectOverflow = throttle(() => {
     if (elementRef != null) {
-      setOverflow(elementRef.scrollHeight > elementRef.clientHeight + Offset);
+      setOverflow(
+        elementRef.scrollHeight > elementRef.clientHeight + Offset ||
+          elementRef.scrollHeight > document.documentElement.clientHeight + Offset,
+      );
     }
-  };
+  }, ThrottleWaitMs);
 
   onMount(() => {
     if (elementRef != null) {
@@ -30,13 +41,17 @@ const useDetectOverflow = () => {
           });
         },
         {
-          threshold: [0, 0.5, 1],
+          threshold: 0,
         },
       );
       observer.observe(elementRef);
 
+      const handleResize = () => detectOverflow();
+      window.addEventListener('resize', handleResize);
+
       onCleanup(() => {
         observer.disconnect();
+        window.removeEventListener('resize', handleResize);
       });
     }
   });