diff --git a/docs.it4i/software/viz/insitu.md b/docs.it4i/software/viz/insitu.md
index 663cf4731c34e84e00d62cfb0abd83f5abef14a6..8a55cd382e5ecb6d5390c94a53032cf11ed69ec0 100644
--- a/docs.it4i/software/viz/insitu.md
+++ b/docs.it4i/software/viz/insitu.md
@@ -48,6 +48,7 @@ It will generate the CxxFullExampleAdaptor executable file. This can be later ru
 Provided example is a simple MPI program. Main executing part is written in FEDriver.cxx. It is a simulator code that creates computational grid   
 
 
+<<<<<<< HEAD
 ```c++
 #include "FEDataStructures.h"
 #include <mpi.h>
@@ -113,6 +114,15 @@ int main(int argc, char** argv)
   MPI_Finalize();
 
   return 0;
+=======
+``` line-numbers
+#include ahoj.h
+
+int main() {
+
+
+return 0;
+>>>>>>> 35cff1d02526d96d67e349fa8874843cbe149def
 }
 ```
 
diff --git a/docs.it4i/software/viz/line-numbers b/docs.it4i/software/viz/line-numbers
new file mode 100644
index 0000000000000000000000000000000000000000..6ebafcf0b37b43a4fd6d489be7d71c104ad3de4a
--- /dev/null
+++ b/docs.it4i/software/viz/line-numbers
@@ -0,0 +1,16 @@
+.line-numbers{
+  /* Set "line-numbers-counter" to 0 */
+  counter-reset: line-numbers-counter;
+}
+
+.line-numbers .remark-code-line::before {
+  /* Increment "line-numbers-counter" by 1 */
+    counter-increment: line-numbers-counter;
+    content: counter(line-numbers-counter);
+    text-align: right;
+    width: 55px;
+    border-right: 1px solid #aaa;
+    display: inline-block;
+    margin-right: 10px;
+    padding: 0 5px;
+}