diff --git a/media/less/sign/sign.less b/media/less/sign/sign.less
index b66aad05978363f2d4d2b2baadd23af2feabcec0..82ed74d61f0c1df7e107dbe4cfceda9f0b67bb99 100644
--- a/media/less/sign/sign.less
+++ b/media/less/sign/sign.less
@@ -12,6 +12,12 @@
     }
 }
 
+input#signin_b {
+    -webkit-appearance: none;
+    -webkit-border-radius: 5px;
+    border-radius: 5px;
+}
+
 h2 {
     text-align: center;
     margin: 5px auto;