conference_main/static/conference_main/styles/main.sass

@@ -217,6 +217,18 @@ button.going-star
 	dt
 		line-height: var(--spacer-4)
 
+/* Apply Web Assets v2 form-control styles to custom rendered classes. */
+.form-control
+	&.custom-file
+		+padding(0)
+
+.custom-file-input,
+.form-control-file
+	@extend .form-control
+
+.custom-file-label
+	display: none
+
 /* Web Assets overrides. */
 // TODO: check component forms in Web Assets v2
 .form-group