General fixes to controls (#831)

* General fixes to controls

Purpose: make input controls consistent with default OpenVK color scheme (which is grayscale)

Additional fixes:
- checkboxes are 15x14, not 14x14.

* Change tints to more UX-friendly

- checkboxes and radio buttons are blue when checked
- enables hover-checked state use in atlas

Web/static/css/style.css

@@ -560,7 +560,8 @@ input[type=radio] {
 }
 
 input[type=checkbox] {
-    background-image: url("data:image/gif;base64,R0lGODlhDwA4AKIHANrh6P///8DK1a22wF+DpbfAy9/l6v///yH5BAEAAAcALAAAAAAPADgAAAOzKLrMJyHKGcWjOFiY5+7eBVbi+I1aCZ6m2rGrm21NrTx2LWMEwYE93yho+PF6gmKHyCJIiEVRMABNcQzBnsFAumK13K5kS9iGjNuwBPbC5RyDuHw+PwwA+LweP7Dv/wB9d4B6goSFfod8iYqGioGMh46NkYSTkpWAgnSccXadnJl/PYOHQaWAQQWoe6qrhK6MBHmujkEArpCDBVkEBQWLu7w9v3mTv77AxpG/ysusmp+gdQkAOw==");
+    background-image: url("data:image/gif;base64,R0lGODlhDwA4ALMAAP//////AP8A//8AAAD//wD/AAAA/wAAADtZd8XKzuHh4crKysHBwba2tv///wAAACH5BAEAAA4ALAAAAAAPADgAAASzcMlJqVsg653X5SDgYeE2luaHdup6rmKLvq5c0rMdjlUvXb6eDoRAkFBF4yqZOBKLi2aJSUNomE1VEoCNkRLJYiLB+oLF5LJmjBinnOO0BncDBi2NvH6/dzQUgIGCgA1+g4cKhX+IgoqMjYaPhJGSjpKJlI+WlZmMm5qdiIp8pHl+paShh0WLj0mtiEywg0kMCbOBTAyUCLlolkkKWJiLZ8PEgGxogZtsY5CwcYOfnqeofREAOw==");
+    width: 15px;
 }
 
 input[type=radio] {
@@ -577,6 +578,11 @@ input[type=radio]:checked {
     background-position: 0 -14px;
 }
 
+input[type=checkbox]:checked:hover,
+input[type=radio]:checked:hover {
+    background-position: 0 -42px;
+}
+
 #auth {
     padding: 10px;
 }