Index: gc_lang/fr/webext/content_scripts/panel.css
==================================================================
--- gc_lang/fr/webext/content_scripts/panel.css
+++ gc_lang/fr/webext/content_scripts/panel.css
@@ -1,11 +1,11 @@
 /*
     CSS
     Content panels for Grammalecte
 */
 
-.grammalecte_panel {
+div.grammalecte_panel {
     all: initial;
     padding: 0;
     margin: 0;
     position: fixed;
     box-sizing: content-box;
@@ -20,44 +20,44 @@
     text-shadow: none;
     text-decoration: none;
     text-align: left;
     hyphens: none;
 }
-.grammalecte_panel img {
+div.grammalecte_panel img {
     display: inline-block;
     margin: 0;
     padding: 0;
 }
 
-.grammalecte_panel_bar {
+div.grammalecte_panel_bar {
     position: sticky;
     width: 100%;
     background-color: hsl(210, 0%, 90%);
     border-radius: 10px 10px 0 0;
     border-bottom: 1px solid hsl(210, 10%, 80%);
     color: hsl(210, 10%, 4%);
     font-size: 20px;
 }
-.grammalecte_panel_title {
+div.grammalecte_panel_title {
     padding: 10px 20px;
 }
-.grammalecte_panel_label {
+div.grammalecte_panel_label {
     display: inline-block;
     padding: 0 10px;
     font-family: "Trebuchet MS", "Fira Sans", "Liberation Sans", sans-serif;
 }
-.grammalecte_panel_invisible_marker {
+div.grammalecte_panel_invisible_marker {
     position: absolute;
     /*visibility: hidden;*/
     font-size: 6px;
     color: hsl(210, 0%, 90%); /* same color than panel_bar background */
 }
 
-.grammalecte_panel_commands {
+div.grammalecte_panel_commands {
     float: right;
 }
-.grammalecte_copy_button {
+div.grammalecte_copy_button {
     display: inline-block;
     padding: 2px 10px;
     background-color: hsl(150, 80%, 30%);
     border-radius: 0 0 0 3px;
     font-family: "Trebuchet MS", "Fira Sans", "Liberation Sans", sans-serif;
@@ -65,14 +65,14 @@
     font-weight: bold;
     color: hsl(150, 0%, 100%);
     text-align: center;
     cursor: pointer;
 }
-.grammalecte_copy_button:hover {
+div.grammalecte_copy_button:hover {
     background-color: hsl(150, 100%, 40%);
 }
-.grammalecte_move_button {
+div.grammalecte_move_button {
     display: inline-block;
     padding: 2px 5px;
     background-color: hsl(180, 80%, 50%);
     font-family: "Trebuchet MS", "Fira Sans", "Liberation Sans", sans-serif;
     font-size: 22px;
@@ -79,14 +79,14 @@
     font-weight: bold;
     color: hsl(180, 0%, 100%);
     text-align: center;
     cursor: pointer;
 }
-.grammalecte_move_button:hover {
+div.grammalecte_move_button:hover {
     background-color: hsl(180, 100%, 60%);
 }
-.grammalecte_close_button {
+div.grammalecte_close_button {
     display: inline-block;
     padding: 2px 10px;
     border-radius: 0 8px 0 0;
     background-color: hsl(0, 80%, 50%);
     font-family: "Trebuchet MS", "Fira Sans", "Liberation Sans", sans-serif;
@@ -94,22 +94,22 @@
     font-weight: bold;
     color: hsl(210, 0%, 100%);
     text-align: center;
     cursor: pointer;
 }
-.grammalecte_close_button:hover {
+div.grammalecte_close_button:hover {
     background-color: hsl(0, 100%, 60%);
 }
 
-.grammalecte_panel_content {
+div.grammalecte_panel_content {
     position: absolute;
     width: 100%;
     height: calc(100% - 55px); /* panel height - title_bar */
     overflow: auto;
 }
 
-.grammalecte_panel_message {
+div.grammalecte_panel_message {
     margin: 10px;
     padding: 10px;
     border-radius: 5px;
     background-color: hsl(0, 50%, 40%);
     color: hsl(0, 50%, 96%);
@@ -119,11 +119,11 @@
 
 
 /*
     Spinner
 */
-.grammalecte_spinner {
+div.grammalecte_spinner {
     visibility: hidden;
     box-sizing: border-box;
     width: 40px;
     height: 40px;
     position: absolute;