disable repeating inria logo background

public/readtheorginria/css/readtheorginria.css

@@ -937,6 +937,7 @@ hr{
     background-color:#E63312;
     background-image: url('inria_logo.png');
     background-position: center top;
+    background-repeat: no-repeat;
     text-align:center;
     padding: 100px 0.809em 0.809em 0.809em;
     display:block;