Change input background colour to darker shade

public/css/themes/solarized-dark.less

@@ -266,8 +266,7 @@ textarea {
   }
 }
 
-form {
-
+form .control-group {
   input[type="text"],
   input[type="password"],
   input[type="number"],
@@ -276,6 +275,6 @@ form {
   input[type="time"],
   textarea,
   select {
-    color: @base02;
+    background-color: @base02;
   }
 }