diff --git a/common/custom.css b/common/custom.css
index 614e02e..c9ae2ae 100644
--- a/common/custom.css
+++ b/common/custom.css
@@ -393,7 +393,7 @@ ol.big-numbers-list li::before {
 .tm-header .uk-navbar-transparent{
     padding-top:4px;
 }
-.uk-logo > img {max-height:80px;}
+.uk-logo > img {max-height:70px;}
 .inner {
     left:0px;
     margin-top:-5px;
diff --git a/css-rules.txt b/css-rules.txt
index 61f7711..8993024 100644
--- a/css-rules.txt
+++ b/css-rules.txt
@@ -7,3 +7,11 @@ B2Note: 5
 Nav-bar: 980
 Modal: 10000
 Modal-Select: 10001
+
+# Screen sizes - width
+
+xs: 0 - 639
+s: 640 - 959
+m: 960 - 1199
+l: 1200 - 1599
+xl: >= 1600