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
@@ -81,14 +81,32 @@
 }
 div.grammalecte_move_button {
     padding: 1px 5px;
     border-radius: 16px;
     color: hsla(180, 0%, 100%, .5);
+    opacity: .5;
+}
+div.grammalecte_move_button_up {
+    padding: 1px 10px;
+    background: center no-repeat url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAYAAABWdVznAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAYdEVYdFNvZnR3YXJlAHBhaW50Lm5ldCA0LjEuNv1OCegAAABcSURBVChTlY67DcAgDEQZhg3oGJMuA9CzoTlbcoQT8zvpFX7cSQQiusKVK1wJCkgfJ/wE4LImA/NuDjCWNWY0lh8wyzvScgW7yIjLTc6zZB7EG/RLx7hyhSvnUOgfudLrksye1QAAAABJRU5ErkJggg==');
+}
+div.grammalecte_move_button_right {
+    padding: 1px 10px;
+    background: center no-repeat url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAYAAABWdVznAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAYdEVYdFNvZnR3YXJlAHBhaW50Lm5ldCA0LjEuNv1OCegAAABlSURBVChTdYs5DoBADAP3hzT0/IyWlpaSlwUHbaIc3pGmSGwPEake5Oeyp7JDli0HygZb3h4w0kbpmFbSKBZNho9qWWWc8M9rWa1c0PNYNCM3THk6psYDW94eUHkhy+hgWRaR8QHurtJh4OI9JwAAAABJRU5ErkJggg==');
+}
+div.grammalecte_move_button_down {
+    padding: 1px 10px;
+    background: center no-repeat url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAYAAABWdVznAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAYdEVYdFNvZnR3YXJlAHBhaW50Lm5ldCA0LjEuNv1OCegAAABcSURBVChTY/j//z9JGKsgPoxVEB/GKogPg4jrJOBKkAYzICYGbAdiuJMIaVoNxHAnEdK0AIjh6pA1gDC6pjlAjKIGhQPFpkAMAhiKQRhDAIqVsYiBMVZB3Pg/AwAQkdVnCojycwAAAABJRU5ErkJggg==');
+}
+div.grammalecte_move_button_left {
+    padding: 1px 10px;
+    background: center no-repeat url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAYAAABWdVznAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAYdEVYdFNvZnR3YXJlAHBhaW50Lm5ldCA0LjEuNv1OCegAAABaSURBVChTY/j//z8+3IguhsJBw/eBeB+aGE4N14AYBIjScBaIYYCghsNAjAzwatgFxOgApwZ9IMYG8NqATRNBP6BrIqgBhJE1EaUBhGGaiNYAwkZAjKbhPwMAP5rVDlUnDt8AAAAASUVORK5CYII=');
 }
 div.grammalecte_move_button:hover {
     background-color: hsla(180, 80%, 50%, .1);
     color: hsla(180, 0%, 100%, 1);
+    opacity: 1;
 }
 div.grammalecte_close_button {
     border-radius: 0 8px 0 4px;
     background-color: hsla(0, 80%, 50%, .5);
     color: hsla(210, 0%, 100%, .5);

Index: gc_lang/fr/webext/content_scripts/panel.js
==================================================================
--- gc_lang/fr/webext/content_scripts/panel.js
+++ gc_lang/fr/webext/content_scripts/panel.js
@@ -72,15 +72,15 @@
         }
         if (this.bFlexible) {
             xButtonLine.appendChild(this._createMoveButton("changeWidth", "⭾", "Bascule la largeur"));
             xButtonLine.appendChild(this._createMoveButton("changeHeight", "⭿", "Bascule la hauteur"));
         }
-        xButtonLine.appendChild(this._createMoveButton("up", "⏶", "Monter"));
-        xButtonLine.appendChild(this._createMoveButton("left", "⏴", "À gauche"));
+        xButtonLine.appendChild(this._createMoveButton("up", " ", "Monter")); // use char ⏶ when Windows 10 be vast majority of OS (Trebuchet MS not updated on other OS)
+        xButtonLine.appendChild(this._createMoveButton("left", " ", "À gauche")); // use char ⏴ when Windows 10 be vast majority of OS (Trebuchet MS not updated on other OS)
         xButtonLine.appendChild(this._createMoveButton("center", "•", "Centrer"));
-        xButtonLine.appendChild(this._createMoveButton("right", "⏵", "À droite"));
-        xButtonLine.appendChild(this._createMoveButton("down", "⏷", "Descendre"));
+        xButtonLine.appendChild(this._createMoveButton("right", " ", "À droite")); // use char ⏵ when Windows 10 be vast majority of OS (Trebuchet MS not updated on other OS)
+        xButtonLine.appendChild(this._createMoveButton("down", " ", "Descendre")); // use char ⏷ when Windows 10 be vast majority of OS (Trebuchet MS not updated on other OS)
         this.xCloseButton = this._createCloseButton();
         xButtonLine.appendChild(this.xCloseButton);
         return xButtonLine;
     }
 
@@ -94,11 +94,11 @@
         xButton.onclick = () => { this.copyTextToClipboard(); };
         return xButton;
     }
 
     _createMoveButton (sAction, sLabel, sTitle) {
-        let xButton = oGrammalecte.createNode("div", {className: "grammalecte_panel_button grammalecte_move_button", textContent: sLabel, title: sTitle});
+        let xButton = oGrammalecte.createNode("div", {className: "grammalecte_panel_button grammalecte_move_button grammalecte_move_button_"+sAction, textContent: sLabel, title: sTitle});
         xButton.onclick = () => { this[sAction](); };
         return xButton;
     }
 
     _createCloseButton () {