diff --git a/libsrc/visualization/mvdraw.cpp b/libsrc/visualization/mvdraw.cpp
index ffa497a3..89aa6cff 100644
--- a/libsrc/visualization/mvdraw.cpp
+++ b/libsrc/visualization/mvdraw.cpp
@@ -38,9 +38,11 @@ namespace netgen
   */
 
   void (*opengl_text_function)(const char * text) = NULL;
-  void Set_OpenGLText_Callback ( void (*fun) (const char * text) )
+  int opengl_text_width = 0;
+  void Set_OpenGLText_Callback ( void (*fun) (const char * text), int width )
   {
     opengl_text_function = fun;
+    opengl_text_width = width;
   }
 
   void MyOpenGLText (const char * text)
@@ -50,6 +52,11 @@ namespace netgen
     // cout << "MyOpenGLText: " << text << endl;
   }
 
+  int MyOpenGLTextWidth ()
+  {
+      return opengl_text_width;
+  }
+
 
   // texture for color decoding
   // GLubyte * VisualScene :: colortexture = NULL;
@@ -602,20 +609,26 @@ namespace netgen
     glPushAttrib (GL_LIST_BIT);
     // glListBase (fontbase);
 
-    char buf[20];
+    constexpr size_t buf_size = 20;
+    char buf[buf_size];
+    GLint viewport[4];
+    glGetIntegerv (GL_VIEWPORT, viewport);
+    double char_width = 2.0*MyOpenGLTextWidth()/(viewport[3]);
     for (int i = 0; i <= 4; i++)
       {
-	double x = minx + i * (maxx-minx) / 4;
-	glRasterPos3d (x, 0.7,-5);
-      
 	double val;
 	if (logscale)
 	  val = minval * pow (maxval / minval, i / 4.0);
 	else
 	  val = minval + i * (maxval-minval) / 4;
 
-	sprintf (buf, "%8.3e", val);
+	snprintf (buf, buf_size, "%8.3e", val);
+        auto n = strlen(buf);
 	// glCallLists (GLsizei(strlen (buf)), GL_UNSIGNED_BYTE, buf);
+	double x = minx + i * (maxx-minx) / 4;
+        x -= 0.5*char_width * n; // center text
+	glRasterPos3d (x, 0.7,-5);
+
 	MyOpenGLText (buf);
       }
 
diff --git a/libsrc/visualization/mvdraw.hpp b/libsrc/visualization/mvdraw.hpp
index d3581724..79830b95 100644
--- a/libsrc/visualization/mvdraw.hpp
+++ b/libsrc/visualization/mvdraw.hpp
@@ -84,7 +84,8 @@ namespace netgen
 
 
   NGGUI_API extern void MyOpenGLText (const char * text);
-  NGGUI_API extern void Set_OpenGLText_Callback ( void (*fun) (const char * text) );
+  NGGUI_API extern int MyOpenGLTextWidth ();
+  NGGUI_API extern void Set_OpenGLText_Callback ( void (*fun) (const char * text), int width );
   NGGUI_API extern VisualScene visual_scene_cross;
   NGGUI_API extern VisualScene *visual_scene;
 
diff --git a/ng/fonts.hpp b/ng/fonts.hpp
index 9443ae01..c4d47a2e 100644
--- a/ng/fonts.hpp
+++ b/ng/fonts.hpp
@@ -2312,6 +2312,8 @@ namespace netgen {
 
             return list_base;
         }
+        int Width() { return w; };
+        int Height() { return h; };
     };
 
     // create Fonts statically and return pointer on selecting
diff --git a/ng/ngpkg.cpp b/ng/ngpkg.cpp
index 96ef4ea1..6cc9984e 100644
--- a/ng/ngpkg.cpp
+++ b/ng/ngpkg.cpp
@@ -1992,7 +1992,7 @@ namespace netgen
 
     SetVisualScene (Togl_Interp(togl));
     visual_scene->DrawScene();
-    Set_OpenGLText_Callback (&MyOpenGLText_GUI);
+    Set_OpenGLText_Callback (&MyOpenGLText_GUI, font->Width());
     return TCL_OK;
   }