add default avatar pic, w/o facebook profile

src/Mine/SeekerBundle/Resources/public/css/style.homepage.css

@@ -242,12 +242,21 @@ main .user-list-filter button {
     border-bottom-right-radius: 3px;
 }
 
+main .user-request-container {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+
 main .user-request-container .user-friend {
     background: #ff0000;
     width: 150px;
     color: #403f3f;
     padding: 10px;
     margin: 10px;
+
+    -webkit-border-radius: 3px;
+    border-radius: 3px;
 }
 
 main .user-request-container h1 {
@@ -261,8 +270,24 @@ main .user-request-container button {
     font-weight: bold;
     color: #ff0000;
     border: 0;
-    padding: 5px;
+    padding: 15px 5px;
     margin: 0 auto;
+
+    -webkit-border-radius: 3px;
+    border-radius: 3px;
+    -webkit-transition: all 250ms ease-in-out;
+    -moz-transition: all 250ms ease-in-out;
+    -o-transition: all 250ms ease-in-out;
+    transition: all 250ms ease-in-out;
+}
+
+main .user-request-container button:hover {
+    background: #ffc38b;
+
+    -webkit-transition: all 250ms ease-in-out;
+    -moz-transition: all 250ms ease-in-out;
+    -o-transition: all 250ms ease-in-out;
+    transition: all 250ms ease-in-out;
 }
 
 @media screen and (max-width: 1200px) {

src/Mine/SeekerBundle/Resources/public/js/mine-user-list/app.js

@@ -86,10 +86,13 @@ class MineUserList extends React.Component {
     }
 
     getProfilePicture(id) {
+        let avatarNbr = Math.floor(Math.random() * 5) + 1;
+
         return id !== null ?
             <img src={"http://graph.facebook.com/" + id + "/picture?type=square&width=130&height=130"}
                  alt="Facebook profile"/> :
-            "";
+            <img src={"/bundles/mineseeker/images/avatar/bg-avatar-default-" + avatarNbr + ".png"}
+                 alt="Default avatar picture"/>;
     }
 
     clickChallengeFriend(isOnline, username) {