add css resource

mattmakai · mattmakai · commit 3f35bb8c6d4c · 2019-09-12T20:14:30.000-04:00
diff --git a/content/pages/03-data/16-pandas.markdown b/content/pages/03-data/16-pandas.markdown
@@ -30,6 +30,10 @@ is a data structures and analysis library.
   is a good tutorial on removing sensitive data from your unfiltered 
   data sets.
 
+* [Learn a new pandas trick every day!](https://www.dataschool.io/python-pandas-tips-and-tricks/)
+  is a running list of great pandas tips that the author originally
+  posted on Twitter and then aggregated onto a single webpage.
+
 * [Time Series Analysis with Pandas](https://www.dataquest.io/blog/tutorial-time-series-analysis-pandas/)
   show you how to combine [Python 3.6](/why-use-python.html), pandas, 
   [matplotlib](/matplotlib.html) and [seaborn](/data-visualization.html)
diff --git a/content/pages/04-web-development/17-css.markdown b/content/pages/04-web-development/17-css.markdown
@@ -205,6 +205,11 @@ web application's design.
   potentially malicious applications, such as the experimental CSS keylogger
   hack that made the rounds in early 2018.
 
+* [Understanding specificity in CSS](https://alligator.io/css/understanding-specificity-in-css/)
+  provides some wonderful detail on the various ways to select elements
+  via CSS selectors, including type selectors, pseudo-elements, class 
+  selectors, attribute selectors and ID selectors.
+
 
 ## CSS learning checklist
 1. Create a simple HTML file with basic elements in it. Use the
