Fix layout in welcome slides

01 - Welcome.ipynb

@@ -2,7 +2,7 @@
  "metadata": {
   "celltoolbar": "Slideshow",
   "name": "",
-  "signature": "sha256:8383961c5c26ad92e66443dcc91561afdb5d9b10020934a220f413ddc8770573"
+  "signature": "sha256:318ca794a2566193c1a821deac41537867c46decd770e1ce9a52eafcc6854bb5"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -235,6 +235,8 @@
       "* Use our etherpad:\n",
       "\n",
       "<br>\n",
+      "<br>\n",
+      "<br>\n",
       "\n",
       "<center style=\"font-size: 300%\">[tinyurl.com/leidencourse](http://tinyurl.com/leidencourse)</center>"
      ]
@@ -287,7 +289,7 @@
        "output_type": "pyout",
        "prompt_number": 1,
        "text": [
-        "<IPython.core.display.HTML at 0x3047a10>"
+        "<IPython.core.display.HTML at 0x2099990>"
        ]
       }
      ],