diff --git a/jsm/Menu.js b/jsm/Menu.js
index 8a1cf18..f4d81dd 100644
--- a/jsm/Menu.js
+++ b/jsm/Menu.js
@@ -172,6 +172,7 @@ export class Menu extends GUI {
         let input = controller.domElement.getElementsByTagName("input")[0]
         input.select()
         input.onkeydown = function (event) {
+            event.preventDefault()
             controller.setValue(event.key)
             input.blur()
         }
diff --git a/jsm/TetraScene.js b/jsm/TetraScene.js
index d65c014..f8b8aed 100644
--- a/jsm/TetraScene.js
+++ b/jsm/TetraScene.js
@@ -12,10 +12,10 @@ export class TetraScene extends THREE.Scene {
         this.vortex = new Vortex(loadingManager)
         this.add(this.vortex)
         
-        this.ambientLight = new THREE.AmbientLight(0xffffff, 1)
+        this.ambientLight = new THREE.AmbientLight(0xffffff, 0.6)
         this.add(this.ambientLight)
         
-        this.directionalLight = new THREE.DirectionalLight(0xffffff, 5)
+        this.directionalLight = new THREE.DirectionalLight(0xffffff, 11)
         this.add(this.directionalLight)
 
         this.theme = settings.theme
@@ -48,7 +48,7 @@ export class TetraScene extends THREE.Scene {
         switch (theme) {
             case "Plasma":
                 this.ambientLight.intensity     = 0.6
-                this.directionalLight.intensity = 5
+                this.directionalLight.intensity = 11
                 this.directionalLight.position.set(5, -20, 20)
                 break
             case "Espace":
diff --git a/jsm/Vortex.js b/jsm/Vortex.js
index e7f6698..6825230 100644
--- a/jsm/Vortex.js
+++ b/jsm/Vortex.js
@@ -47,7 +47,7 @@ export class Vortex extends THREE.Group {
                     texture.repeat.set(1, 2)
                     this.darkCylinder.material.map = texture
                 })
-                this.darkCylinder.material.opacity = 0.17
+                this.darkCylinder.material.opacity = 0.05
 
                 new THREE.TextureLoader(this.loadingManager).load("./images/plasma2.jpg", texture => {
                     texture.wrapS = THREE.RepeatWrapping
@@ -55,7 +55,7 @@ export class Vortex extends THREE.Group {
                     texture.repeat.set(2, 2)
                     this.colorFullCylinder.material.map = texture
                 })
-                this.colorFullCylinder.material.opacity = 0.5
+                this.colorFullCylinder.material.opacity = 0.8
 
                 this.globalRotation           = 0.028
                 this.darkTextureRotation      = 0.005