diff --git a/conference/index.html b/conference/index.html
index d6de71b..b035774 100644
--- a/conference/index.html
+++ b/conference/index.html
@@ -299,7 +299,7 @@
   <tr>
     <td>09:00 - 10:00</td>
     <td>
-  <h5><ul class="list-group list-group-horizontal text-center">
+  <h5><ul class="list-group flex-column flex-sm-row text-center">
   <li class="list-group-item"><a href="#s1"><span class="badge badge-dark">S1</span></a><br><small><a href="https://zoom.us/j/92592031296"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
   <li class="list-group-item"><a href="#s2"><span class="badge badge-primary">S2</span></a><br><small><a href="https://zoom.us/j/94933037530"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
   <li class="list-group-item"><a href="#s3"><span class="badge badge-secondary">S3</span></a><br><small><a href="https://zoom.us/j/98945475885"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
@@ -311,7 +311,7 @@
   <tr>
     <td>10:30 - 11:30</td>
     <td>
-     <h5><ul class="list-group list-group-horizontal text-center">
+     <h5><ul class="list-group flex-column flex-sm-row text-center">
   <li class="list-group-item"><a href="#s5"><span class="badge badge-danger">S5</span></a><br><small><a href="https://zoom.us/j/92592031296"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
   <li class="list-group-item"><a href="#s6"><span class="badge badge-warning">S6</span></a><br><small><a href="https://zoom.us/j/94933037530"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
 </ul></h5>
@@ -328,7 +328,7 @@
     <tr>
     <td>14:30 - 15:30</td>
     <td><h5>
-    <ul class="list-group list-group-horizontal text-center">
+    <ul class="list-group flex-column flex-sm-row text-center">
   <li class="list-group-item"><a href="#s1"><span class="badge badge-dark">S1</span></a><br><small><a href="https://zoom.us/j/92592031296"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
   <li class="list-group-item"><a href="#s2"><span class="badge badge-primary">S2</span></a><br><small><a href="https://zoom.us/j/94933037530"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
 </ul> </h5>
@@ -337,11 +337,11 @@
   </tr>
   <tr>
     <td>15:30 - 16:00</td>
-    <td><a href="#p1"><span class="badge badge-light" style="background:rgb(224,194,255);">Poster Session 1: Tools</span></a><br><small><a href="https://zoom.us/j/92376414517"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></td>
+    <td><a href="#p1"><span class="badge badge-light" style="background:rgb(224,194,255);">Poster Session 1</span></a><br><small><a href="https://zoom.us/j/92376414517"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></td>
   </tr>
   <tr>
     <td>16:00 - 16:30</td>
-    <td><a href="#p2"><span class="badge badge-light" style="background:rgb(224,194,255);">Poster Session 2: Modelling connected and intelligent traffic</span></a><br><small><a href="https://zoom.us/j/92376414517"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></td>
+    <td><a href="#p2"><span class="badge badge-light" style="background:rgb(224,194,255);">Poster Session 2</span></a><br><small><a href="https://zoom.us/j/92376414517"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></td>
   </tr>
   <tr>
     <td>17:00</td>
@@ -362,7 +362,7 @@
   <tr>
     <td>09:00 - 10:00</td>
     <td><h5>
-     <ul class="list-group list-group-horizontal text-center">
+     <ul class="list-group flex-column flex-sm-row text-center">
   <li class="list-group-item"><a href="#s2"><span class="badge badge-primary">S2</span></a><br><small><a href="https://zoom.us/j/92592031296"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
   <li class="list-group-item"><a href="#s4"><span class="badge badge-success">S4</span></a><br><small><a href="https://zoom.us/j/94933037530"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
   <li class="list-group-item"><a href="#s6"><span class="badge badge-warning">S6</span></a><br><small><a href="https://zoom.us/j/98945475885"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
@@ -373,7 +373,7 @@
     <tr>
     <td>10:30 - 11:30</td>
     <td><h5>
-     <ul class="list-group list-group-horizontal text-center">
+     <ul class="list-group flex-column flex-sm-row text-center">
   <li class="list-group-item"><a href="#s1"><span class="badge badge-dark">S1</span></a><br><small><a href="https://zoom.us/j/92592031296"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
   <li class="list-group-item"><a href="#s3"><span class="badge badge-secondary">S3</span></a><br><small><a href="https://zoom.us/j/94933037530"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
   <li class="list-group-item"><a href="#s5"><span class="badge badge-danger">S5</span></a><br><small><a href="https://zoom.us/j/98945475885"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
@@ -387,7 +387,7 @@
   <tr>
     <td>13:00 - 14:00</td>
     <td><h5>
-     <ul class="list-group list-group-horizontal text-center">
+     <ul class="list-group flex-column flex-sm-row text-center">
   <li class="list-group-item"><a href="#s3"><span class="badge badge-secondary">S3</span></a><br><small><a href="https://zoom.us/j/92592031296"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
   <li class="list-group-item"><a href="#s4"><span class="badge badge-success">S4</span></a><br><small><a href="https://zoom.us/j/94933037530"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
   <li class="list-group-item"><a href="#s5"><span class="badge badge-danger">S5</span></a><br><small><a href="https://zoom.us/j/98945475885"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></li>
@@ -398,11 +398,11 @@
   </tr>
   <tr>
     <td>14:30 - 15:00</td>
-    <td><a href="#p3"><span class="badge badge-light" style="background:rgb(224,194,255);">Poster Session 3: Simulation Scenarios</span></a><br><small><a href="https://zoom.us/j/92376414517"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></td>
+    <td><a href="#p3"><span class="badge badge-light" style="background:rgb(224,194,255);">Poster Session 3</span></a><br><small><a href="https://zoom.us/j/92376414517"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></td>
   </tr>
     <tr>
     <td>15:00 - 15:30</td>
-    <td><a href="#p4"><span class="badge badge-light" style="background:rgb(224,194,255);">Poster Session 4: Routing</span></a><br><small><a href="https://zoom.us/j/92376414517"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></td>
+    <td><a href="#p4"><span class="badge badge-light" style="background:rgb(224,194,255);">Poster Session 4</span></a><br><small><a href="https://zoom.us/j/92376414517"><span class="badge badge-pill badge-primary" style="margin-top: 10px;"><i class="fas fa-video"></i> Join</span></a></small></td>
   </tr>
     <tr>
     <td>15:30 - 16:00</td>
diff --git a/css/custom.css b/css/custom.css
index bb0aa7a..88f2da3 100644
--- a/css/custom.css
+++ b/css/custom.css
@@ -85,10 +85,9 @@
 }
 
 .list-group-item {
-/* background-color: transparent;
-border: transparent; */
+background-color: #e7edf2 !important;
 padding: 5px;
-margin-right: 20px;
+margin: 0 10px;
 }
 
 .member-logo {
@@ -250,8 +249,8 @@
 
 thead tr th:first-child,
 tbody tr td:first-child {
-width: 8em;
-min-width: 8em;
+width: 7em;
+min-width: 7em;
 max-width: 8em;
 word-break: break-all;
 }