Fix wrong CSS selectors causing bleeding of footer link atributes to other links

geo.css

@@ -29,12 +29,16 @@ form {
   text-align: center;
 }
 
-div.basic_stats , div.footer {
+div.basic_stats {
 	text-align: center;
 	padding-bottom: 20px;
 }
 
-table, dl, .histogram_others, .heatmap, .footer {
+a:link, a:visited, a:hover, a:active {
+	color: #48B;
+}
+
+table, dl, .histogram_others, .heatmap {
     margin-left:  auto;
     margin-right:  auto;
 	padding-bottom: 20px;
@@ -44,13 +48,14 @@ table, dl, .histogram_others, .heatmap, .footer {
 	display: block;
 }
 
-.footer {
-    font-weight: normal;
+#footer {
+	text-align: center;
+	font-weight: normal;
 	color: #999;
 	font-size: 10px;
 }
 
-.footer a:link, a:visited, a:hover {
+#footer a:link, #footer a:visited, #footer a:hover, #footer a:active {
 	text-decoration: none;
 	font-weight: bold;
 	color: #666;

geostat.cpp

@@ -474,7 +474,7 @@ int main(int argc, char** argv) {
 	}
 
 	if (show_html) {
-		std::cout << "<div class=\"footer\">\n";
+		std::cout << "<div id=\"footer\">\n";
 		std::cout << "Stats generated by <a href=\"https://gitlab.com/tomaszg/geostat\">GeoStat</a>.<br>\n";
 		std::cout << "Data obtained from Opencaching sites via <a href=\"https://github.com/opencaching/okapi/\">OKAPI</a>:<br>\n";
 		std::cout << "<a href=\"https://www.opencaching.pl/\">Opencaching.pl</a>, ";