fix title

content/index.txt

@@ -34,8 +34,8 @@ This figure shows the local density of state of a quantum billiard with a stadiu
 The entire code to perform this calculation (including making the figure) is reproduced below and is, as one can see, rather small.
 
 
-Example of a three dimensional created with Kwant
----------------------------
+3-d systems
+-----------
 
 .. container:: leftside
 
@@ -72,4 +72,4 @@ conductance of a Corbino disk in a quantum Hall regime
 Transport properties of a Corbino disk across a quantum Hall transition. Left
 panel: winding number of the reflection matrix, which has to change from 0 to 1
 across the transition. Right panel: conductance across the transition, showing
-quantized conductance peaks.
\ No newline at end of file
+quantized conductance peaks.