diff --git a/src/pretix/static/pretixbase/scss/_theme.scss b/src/pretix/static/pretixbase/scss/_theme.scss
index eb32d06ec4..b00189e8c2 100644
--- a/src/pretix/static/pretixbase/scss/_theme.scss
+++ b/src/pretix/static/pretixbase/scss/_theme.scss
@@ -117,6 +117,11 @@ input[type=number]::-webkit-outer-spin-button {
   border: transparent;
 }
 
+.btn.disabled, .btn[disabled], fieldset[disabled] .btn {
+  box-shadow: 0px 0px 0px 1px #ccc inset, inset 0 1px 3px 0 #d9d9d9;
+  opacity: 0.7;
+}
+
 .btn-group-flex { display: flex; }
 .btn-group-flex > .btn { flex: 1; }