Soften the corners

docs/distributions/openstack.md

@@ -93,7 +93,6 @@ that will open in a new tab.
 
   </fieldset>
 
-  <hr />
   <center>
     <button type="button" name="run" onclick="runImageTests()" disabled>Run 0 tests</button>
   </center>

docs/stylesheets/extra.css

@@ -18,10 +18,12 @@ form.testing {
   padding: 0.5em;
   margin: auto;
   max-width: 80%;
+  border-radius: 4px;
 }
 
 .testing input {
   border: 1px solid black;
+  border-radius: 4px;
   padding: 5px;
   margin: 5px;
 }
@@ -50,6 +52,7 @@ form.testing {
 
 .testing fieldset {
   margin-inline: 10px;
+  border-radius: 4px;
 }
 
 .testing legend {