notifications: restyle a bit so we don't have invisible element obscure html

rhodecode/public/js/src/components/rhodecode-toast/rhodecode-toast.less

@@ -4,6 +4,7 b''
 paper-toast{
     width: 100%;
     min-width: 400px;
+    padding: 0px;
     --paper-toast-background-color: transparent;
     --paper-toast-color: #000000;
     .box-shadow(none);
@@ -15,13 +16,14 b' paper-toast a{'
 .toast-message-holder {
 }
 .toast-close {
-    text-align: right;
-
+    right: -5px;
+    position: absolute;
+    bottom: -45px;
     paper-button{
         .box-shadow(0 2px 5px 0 rgba(0, 0, 0, 0.15));
     }
 }
 paper-toast .alert{
-    margin: 0px 0 @padding 0;
+    margin: @padding 0 0 0;
     .box-shadow(0 2px 5px 0 rgba(0, 0, 0, 0.15));
 }