Fix CSS (leshan adopters) again ...

Signed-off-by: Simon Bernard <sbernard@sierrawireless.com>
diff --git a/css/leshan.css b/css/leshan.css
index 7b514ff..0d281b1 100644
--- a/css/leshan.css
+++ b/css/leshan.css
@@ -410,7 +410,6 @@
 .highlight.who img {
     width: 60%;
     max-width: 250px;
-    height: 100%;
 }
 
 .highlight.who a::after {
@@ -421,6 +420,8 @@
     display: flex ;
     flex-flow: row wrap;
     padding: 0;
+    justify-content: center;
+    align-items: center;
 }
 
 .highlight.who ul.user-logos > li {