diff --git a/.DS_Store b/.DS_Store
index 05a3f32..77c11bd 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/IS_group_assignment_yana_garipova.pdf b/IS_group_assignment_yana_garipova.pdf
new file mode 100644
index 0000000..d6e1ad9
Binary files /dev/null and b/IS_group_assignment_yana_garipova.pdf differ
diff --git a/Let_s_Talk_Cryptocoin.pdf b/Let_s_Talk_Cryptocoin.pdf
new file mode 100644
index 0000000..830fb82
Binary files /dev/null and b/Let_s_Talk_Cryptocoin.pdf differ
diff --git a/main.css b/main.css
index ca7ef8e..025baa2 100644
--- a/main.css
+++ b/main.css
@@ -62,6 +62,7 @@ p{
   padding: 5px 5px 5px 5px;
   background-color: rgb(103,108,115);
   border: black solid thin;
+  overflow: hidden;
 }
 /*
 .slide{
diff --git a/portfolio.html b/portfolio.html
index 295278d..6223f40 100644
--- a/portfolio.html
+++ b/portfolio.html
@@ -8,15 +8,22 @@ <h2><i>Portfolio</i></h2>
 <div class="portfolio_main">
   <div class="portfolio_entry">
     <h3>Network Optimization</h3>
-    <p>Project 1: Optimizing Garg-Könemann algorithm to solve Maximum Lifetime Scheduling problem for large sensor networks.</p>
+    <p>Project 1 (2021): Improving Garg-Könemann algorithm to solve Maximum Lifetime Scheduling problem for large sensor networks.</p>
     <a href="NetOpt20_gkpro_Yana_Garipova.pdf" target = "_blank"> --> PDF</a>
     <br>
     <a href="https://drive.google.com/file/d/15FpKTnXeL9-ywARyhxw9UD8K2zZw3H44/view?usp=sharing" target = "_blank"> --> Google Colab notebook</a>
   </div>
 
+  <div class="portfolio_entry">
+    <h3>Information Security</h3>
+    <p>Group assignment for <i>the Algorithms for Information Security and Privacy</i> course (2020): Discussion on Multisinature protocols that optimize blockchain.</p>
+    <a href="IS_group_assignment_yana_garipova.pdf" target = "_blank"> --> PDF</a>
+    <p>Project 1 (2018): Understanding technology behind cryptocurrency and blockchain.</p>
+    <a href="Let_s_Talk_Cryptocoin.pdf" target = "_blank"> --> PDF</a>
+  </div>
 
   <div class="portfolio_entry">
-    <img src="mypc.png" alt="my pc" width="450px">
+    <img src="mypc.png" alt="my pc" width="400px">
   </div>