CSS update for web interface

geo.css

@@ -25,10 +25,14 @@ h2 {
 	color: #48B;
 }
 
-form {
+.center {
 	text-align: center;
 }
 
+input[type=number] {
+	width: 60px;
+}
+
 div.basic_stats {
 	text-align: center;
 	padding-bottom: 20px;
@@ -199,3 +203,13 @@ dl {
 	padding: .5rem 1rem;
 }
 
+.row {
+  display: flex;
+  width: 900px;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+.column {
+  flex: 50%;
+}