diff --git a/src/components/ConversationCard/index.jsx b/src/components/ConversationCard/index.jsx
index eaad4fc..7adf2fc 100644
--- a/src/components/ConversationCard/index.jsx
+++ b/src/components/ConversationCard/index.jsx
@@ -9,6 +9,7 @@ import { WindowDesktop, XLg } from 'react-bootstrap-icons'
 import FileSaver from 'file-saver'
 import { render } from 'preact'
 import FloatingToolbar from '../FloatingToolbar'
+import { useClampWindowSize } from '../../hooks/use-clamp-window-size'
 
 const logo = Browser.runtime.getURL('logo.png')
 
@@ -32,6 +33,7 @@ function ConversationCard(props) {
   const [isReady, setIsReady] = useState(!props.question)
   const [port, setPort] = useState(() => Browser.runtime.connect())
   const [session, setSession] = useState(props.session)
+  const windowSize = useClampWindowSize([0, Infinity], [250, 1100])
   /**
    * @type {[ConversationItemData[], (conversationItemData: ConversationItemData[]) => void]}
    */
@@ -213,7 +215,7 @@ function ConversationCard(props) {
         </span>
       </div>
       <hr />
-      <div className="markdown-body">
+      <div className="markdown-body" style={{ maxHeight: windowSize[1] * 0.75 + 'px' }}>
         {conversationItemData.map((data, idx) => (
           <ConversationItem
             content={data.content}
diff --git a/src/components/FloatingToolbar/index.jsx b/src/components/FloatingToolbar/index.jsx
index b1ca225..43fcebc 100644
--- a/src/components/FloatingToolbar/index.jsx
+++ b/src/components/FloatingToolbar/index.jsx
@@ -6,6 +6,7 @@ import { defaultConfig, getUserConfig } from '../../config.mjs'
 import { config as toolsConfig } from '../../content-script/selection-tools'
 import { setElementPositionInViewport } from '../../utils'
 import Draggable from 'react-draggable'
+import { useClampWindowSize } from '../../hooks/use-clamp-window-size'
 
 const logo = Browser.runtime.getURL('logo.png')
 
@@ -16,6 +17,7 @@ function FloatingToolbar(props) {
   const [render, setRender] = useState(false)
   const [position, setPosition] = useState(props.position)
   const [virtualPosition, setVirtualPosition] = useState({ x: 0, y: 0 })
+  const windowSize = useClampWindowSize([750, 1500], [0, Infinity])
 
   useEffect(() => {
     getUserConfig()
@@ -68,7 +70,7 @@ function FloatingToolbar(props) {
           onStop={dragEvent.onStop}
           position={virtualPosition}
         >
-          <div className="gpt-selection-window">
+          <div className="gpt-selection-window" style={{ width: windowSize[0] * 0.4 + 'px' }}>
             <div className="chat-gpt-container">
               <ConversationCard
                 session={props.session}
diff --git a/src/content-script/styles.scss b/src/content-script/styles.scss
index 54f15bb..fff87b5 100644
--- a/src/content-script/styles.scss
+++ b/src/content-script/styles.scss
@@ -65,7 +65,6 @@
     padding: 5px 15px 10px;
     background-color: var(--theme-color);
     color: var(--font-color);
-    max-height: 800px;
     resize: vertical;
     overflow-y: auto;
 
@@ -188,7 +187,7 @@
 
   .dragbar {
     cursor: move;
-    width: 250px;
+    width: 42%;
     height: 12px;
     border-radius: 10px;
     background-color: var(--dragbar-color);
@@ -229,7 +228,6 @@
 }
 
 .gpt-selection-window {
-  width: 600px;
   height: auto;
   border-radius: 8px;
   background-color: var(--theme-color);
diff --git a/src/hooks/use-clamp-window-size.mjs b/src/hooks/use-clamp-window-size.mjs
new file mode 100644
index 0000000..86c8a2b
--- /dev/null
+++ b/src/hooks/use-clamp-window-size.mjs
@@ -0,0 +1,8 @@
+import { useWindowSize } from './use-window-size.mjs'
+
+export function useClampWindowSize(widthRange = [0, Infinity], heightRange = [0, Infinity]) {
+  const windowSize = useWindowSize()
+  windowSize[0] = Math.min(widthRange[1], Math.max(windowSize[0], widthRange[0]))
+  windowSize[1] = Math.min(heightRange[1], Math.max(windowSize[1], heightRange[0]))
+  return windowSize
+}
diff --git a/src/hooks/use-window-size.mjs b/src/hooks/use-window-size.mjs
new file mode 100644
index 0000000..8451dcf
--- /dev/null
+++ b/src/hooks/use-window-size.mjs
@@ -0,0 +1,16 @@
+// https://stackoverflow.com/questions/19014250/rerender-view-on-browser-resize-with-react
+
+import { useLayoutEffect, useState } from 'react'
+
+export function useWindowSize() {
+  const [size, setSize] = useState([0, 0])
+  useLayoutEffect(() => {
+    function updateSize() {
+      setSize([window.innerWidth, window.innerHeight])
+    }
+    window.addEventListener('resize', updateSize)
+    updateSize()
+    return () => window.removeEventListener('resize', updateSize)
+  }, [])
+  return size
+}
diff --git a/src/utils/set-element-position-in-viewport.mjs b/src/utils/set-element-position-in-viewport.mjs
index 4f1c13b..83cceb7 100644
--- a/src/utils/set-element-position-in-viewport.mjs
+++ b/src/utils/set-element-position-in-viewport.mjs
@@ -1,6 +1,6 @@
 export function setElementPositionInViewport(element, x = 0, y = 0) {
-  const retX = Math.min(window.innerWidth - element.offsetWidth, Math.max(0, x))
-  const retY = Math.min(window.innerHeight - element.offsetHeight, Math.max(0, y))
+  const retX = Math.min(Math.max(0, window.innerWidth - element.offsetWidth), Math.max(0, x))
+  const retY = Math.min(Math.max(0, window.innerHeight - element.offsetHeight), Math.max(0, y))
   element.style.left = retX + 'px'
   element.style.top = retY + 'px'
   return { x: retX, y: retY }