diff --git a/cara/apps/calculator/static/css/form.css b/cara/apps/calculator/static/css/form.css
index 254dc4b4..bbc7f767 100644
--- a/cara/apps/calculator/static/css/form.css
+++ b/cara/apps/calculator/static/css/form.css
@@ -23,10 +23,10 @@
 .tooltip_text {
   position: relative;
   background: rgba(59, 72, 80, 0.9);
-  padding: 0px 7px;
+  padding: 0px 8px;
   margin: 5px;
-  font-size: 18px;
-  border-radius: 80%;
+  font-size: 13px;
+  border-radius: 100%;
   color: #FFF;
 }
 
diff --git a/cara/apps/calculator/templates/calculator.form.html.j2 b/cara/apps/calculator/templates/calculator.form.html.j2
index c040e903..d2953819 100644
--- a/cara/apps/calculator/templates/calculator.form.html.j2
+++ b/cara/apps/calculator/templates/calculator.form.html.j2
@@ -192,8 +192,9 @@
   This tool simulates the long range airborne spread SARS-CoV-2 virus in a finite volume and estimates the risk of COVID-19 infection. It is based on current scientific data and can be used to measures the effectiveness of different mitigation measures.<br>
   <b>Ventilation data:</b> <br>
   <ul>
-    <li>Mechanical ventilation = check with a specialist for the air flow or air change rate.</li>
-    <li>HEPA filtration = enter the air flow of the device. The following values are based on the different fan velocities of a specific commercial device proposed by the HSE Unit:</li>
+    <li>Mechanical ventilation = check the rates with a specialist.</li>
+    <li>Natural ventilation = the window opening distance is between the fixed frame and movable part when open.</li> 
+    <li>HEPA filtration = the air flow of the device. The following values are based on the different fan velocities of a specific commercial device proposed by the HSE Unit:</li>
     <ul>
         <li>Level 6 (max) = 430 m^3/h (noisy)</li>
         <li>Level 5 = 250 m^3/h (ok w.r.t. noise)</li>
@@ -209,8 +210,7 @@
   </ul>
   <b>Activity breaks:</b><br>
   <ul>
-    <li>Specify if a lunch break should be included, and when it starts/finishes.</li>
-    <li>If you will take coffee breaks, they are spread out evenly throughout the day, in addition to lunch.</li>
+    <li>If coffee breaks are included, they are spread out evenly throughout the day, in addition to lunch.</li>
   </ul>
   Refer to <a href="/calculator/user-guide"> COVID Calculator user-guide </a> for more detailed explanations on how to use this tool. <br>
 </div>