6 files changed, 14 insertions, 14 deletions
diff --git a/ext/bg/search.html b/ext/bg/search.html
index 6930830a..9d28b358 100644
--- a/ext/bg/search.html
+++ b/ext/bg/search.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en" class="yomichan-search">
+<html lang="en" data-yomichan-page="search">
     <head>
         <meta charset="UTF-8">
         <meta name="viewport" content="width=device-width,initial-scale=1" />
diff --git a/ext/bg/settings-popup-preview.html b/ext/bg/settings-popup-preview.html
index 3d426f7a..bfe4550c 100644
--- a/ext/bg/settings-popup-preview.html
+++ b/ext/bg/settings-popup-preview.html
@@ -24,7 +24,7 @@
                 font-family: "Helvetica Neue", Helvetica, Arial ,sans-serif;
                 font-size: 14px;
             }
-            iframe#yomichan-float {
+            iframe.yomichan-float {
                 resize: none;
             }
             .vertical-align-outer {
diff --git a/ext/fg/css/client.css b/ext/fg/css/client.css
index 4b824da3..633c88ef 100644
--- a/ext/fg/css/client.css
+++ b/ext/fg/css/client.css
@@ -17,7 +17,7 @@
  */
 
 
-iframe#yomichan-float {
+iframe.yomichan-float {
     all: initial;
     background-color: #fff;
     border: 1px solid #999;
@@ -29,14 +29,14 @@ iframe#yomichan-float {
     box-sizing: border-box;
 }
 
-iframe#yomichan-float[data-yomichan-theme=dark],
-iframe#yomichan-float[data-yomichan-theme=auto][data-yomichan-site-color=dark] {
+iframe.yomichan-float[data-yomichan-theme=dark],
+iframe.yomichan-float[data-yomichan-theme=auto][data-yomichan-site-color=dark] {
     background-color: #1e1e1e;
     border: 1px solid #666;
     box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
 }
 
-iframe#yomichan-float.yomichan-float-full-width {
+iframe.yomichan-float.yomichan-float-full-width {
     border-left: none;
     border-right: none;
     left: 0 !important;
@@ -46,13 +46,13 @@ iframe#yomichan-float.yomichan-float-full-width {
     resize: none;
 }
 
-iframe#yomichan-float.yomichan-float-full-width:not(.yomichan-float-above) {
+iframe.yomichan-float.yomichan-float-full-width:not(.yomichan-float-above) {
     border-bottom: none;
     top: auto !important;
     bottom: 0 !important;
 }
 
-iframe#yomichan-float.yomichan-float-full-width.yomichan-float-above {
+iframe.yomichan-float.yomichan-float-full-width.yomichan-float-above {
     border-top: none;
     top: 0 !important;
     bottom: auto !important;
diff --git a/ext/fg/float.html b/ext/fg/float.html
index 2504f448..580a7963 100644
--- a/ext/fg/float.html
+++ b/ext/fg/float.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en" class="yomichan-float">
+<html lang="en" data-yomichan-page="float">
     <head>
         <meta charset="UTF-8">
         <meta name="viewport" content="width=device-width,initial-scale=1" />
diff --git a/ext/fg/js/popup.js b/ext/fg/js/popup.js
index 73ed37e0..2a9670fc 100644
--- a/ext/fg/js/popup.js
+++ b/ext/fg/js/popup.js
@@ -27,7 +27,7 @@ class Popup {
         this.child = null;
         this.childrenSupported = true;
         this.container = document.createElement('iframe');
-        this.container.id = 'yomichan-float';
+        this.container.className = 'yomichan-float';
         this.container.addEventListener('mousedown', e => e.stopPropagation());
         this.container.addEventListener('scroll', e => e.stopPropagation());
         this.container.setAttribute('src', chrome.extension.getURL('/fg/float.html'));
diff --git a/ext/mixed/css/display.css b/ext/mixed/css/display.css
index 7ebad090..7793ddeb 100644
--- a/ext/mixed/css/display.css
+++ b/ext/mixed/css/display.css
@@ -30,8 +30,8 @@
  * General
  */
 
-html.yomichan-float:not([data-yomichan-theme]),
-html.yomichan-float:not([data-yomichan-theme]) body {
+html:root[data-yomichan-page=float]:not([data-yomichan-theme]),
+html:root[data-yomichan-page=float]:not([data-yomichan-theme]) body {
     background-color: transparent;
 }
 
@@ -82,8 +82,8 @@ ol, ul {
     padding-bottom: 10px;
 }
 
-html:root.yomichan-float .entry,
-html:root.yomichan-float .note {
+html:root[data-yomichan-page=float] .entry,
+html:root[data-yomichan-page=float] .note {
     padding-left: 10px;
     padding-right: 10px;
 }