diff --git a/src/sao.less b/src/sao.less
index 5b7771b433..5f3ebab108 100644
--- a/src/sao.less
+++ b/src/sao.less
@@ -43,6 +43,18 @@
     }
 }
 
+.modal-lg {
+    width: 100%;
+    height: 100%;
+    margin: 0;
+    padding: 0;
+
+    & .modal-content {
+        height: auto;
+        border-radius: 0;
+    }
+}
+
 input[type='color'] {
     & .btn {
         height: @line-height-base;