Implemented UserPage

front/src/App.css

@@ -1,16 +1,9 @@
-body {
-  height: 100vh;
-  overflow: hidden;
-  color: white;
-  font-family: sans-serif;
-}
-
-.modal-content, .modal-content .form-select {
-  background-color: rgb(17, 17, 17) !important;
+:root {
+  --bs-body-bg: rgb(17, 17, 17) !important;
 }
 
 /* В связи со сложившейся политической обстановкой */
 .leaflet-attribution-flag {
   position: absolute;
   right: -100px;
-}
+}