Update styles.css

 styles.css | 1 +
 1 file changed, 1 insertion(+)

diff --git a/styles.css b/styles.css
index c693ff5..4aa7df4 100644
--- a/styles.css
+++ b/styles.css
@@ -1,4 +1,5 @@
 box {
  color: red;
  margin: auto;
+ border: 2px black;
 }