diff --git a/src/ui/Prompts.js b/src/ui/Prompts.js
index 439fbf0..b1d08de 100644
--- a/src/ui/Prompts.js
+++ b/src/ui/Prompts.js
@@ -63,8 +63,8 @@ var Prompts = (() => {
       checks: [],
       buttons: [_("Ok"), _("Cancel")],
       multiple: "close", // or "queue", or "focus"
-      width: 400,
-      height: 300,
+      width:  500,
+      height: 400,
       alwaysOnTop: true,
     },
     async prompt(features) {
diff --git a/src/ui/prompt.css b/src/ui/prompt.css
index abada75..7d9f8a7 100644
--- a/src/ui/prompt.css
+++ b/src/ui/prompt.css
@@ -6,6 +6,7 @@ body {
   color: #222;
   margin: 0px;
   padding: 8px;
+  background: linear-gradient(to bottom, #e4f5fc 0%,#bfe8f9 41%,#9fd8ef 90%,#2ab0ed 100%) no-repeat;
 }
 
 #header {
@@ -13,10 +14,9 @@ body {
   margin: 0;
   line-height: 24px;
   color: #048;
-  position: relative;
   font-size: 24px;
   z-index: 500;
-  padding: 8px;
+  padding: 8px 8px 0 8px;
   display: block;
   background: url(/img/icon96.png) no-repeat top right;
   height: 96px;
@@ -25,23 +25,21 @@ body {
 #title {
   margin-right: 96px;
   font-size: 24px;
-  position: absolute;
   bottom: 0;
   top: 0;
 }
 
 #main {
-  background: linear-gradient(to bottom, #e4f5fc 0%,#bfe8f9 41%,#9fd8ef 90%,#2ab0ed 100%) no-repeat;
   display: flex;
   flex-direction: column;
   align-items: center;
-  padding: 120px 16px 16px 16px;
+  padding: 0 16px;
   top: 0;
   left: 0;
   right:0;
   bottom: 0;
-  position: fixed;
   justify-content: center;
+  overflow: auto;
 }
 #message {
   flex-grow: 1;
diff --git a/src/ui/prompt.js b/src/ui/prompt.js
index f19aac9..7c45065 100644
--- a/src/ui/prompt.js
+++ b/src/ui/prompt.js
@@ -88,4 +88,18 @@
   for (let b of document.querySelectorAll("#buttons button")) {
     b.addEventListener("click", buttonClicked);
   }
+
+  let resize = async () => {
+    let win = await browser.windows.getCurrent();
+    let delta = document.documentElement.offsetHeight - window.innerHeight;
+    await browser.windows.update(win.id, {
+        width: win.width, height: win.height + delta,
+        left: win.left, top: win.top - Math.round(delta / 2)
+      });
+  }
+  if (document.readyState === "complete") {
+    resize();
+  } else {
+    window.addEventListener("load", resize);
+  }
 })();