Update pialert.css

Added option for "Back Button" to hide it on small screens
Added option for "Next Button" to hide it on small screens
Added option for "Reload Button" to hide it on small screens
Added option for "Full Screen Button" to hide it on small screens

front/css/pialert.css

@@ -906,4 +906,30 @@ height: 50px;
 {
     width:480px;
     
-}
+}
+
+/*Hidden special button*/
+
+@media (max-width: 464px) {
+  #back-button {
+    display: none;
+  }
+}
+
+@media (max-width: 432px) {
+  #next-button {
+    display: none;
+  }
+}
+
+@media (max-width: 400px) {
+  #reload-button {
+    display: none;
+  }
+}
+
+@media (max-width: 365px) {
+  #fullscreen-button {
+    display: none;
+  }
+}