update

dist/bundle.css

@@ -4648,6 +4648,12 @@ ul.ztree.zTreeDragUL {
   box-sizing: border-box;
   /*W3C标准(IE9+，Safari5.1+,Chrome10.0+,Opera10.6+都符合box-sizing的w3c标准语法)*/
 }
+.bi-single-select-combo .single-select-trigger-icon-button {
+  font-size: 16px;
+}
+.bi-single-select-combo .single-select-trigger-icon-button {
+  font-size: 16px;
+}
 .bi-single-slider-label {
   min-height: 50px;
 }

dist/fineui.css

@@ -4648,6 +4648,12 @@ ul.ztree.zTreeDragUL {
   box-sizing: border-box;
   /*W3C标准(IE9+，Safari5.1+,Chrome10.0+,Opera10.6+都符合box-sizing的w3c标准语法)*/
 }
+.bi-single-select-combo .single-select-trigger-icon-button {
+  font-size: 16px;
+}
+.bi-single-select-combo .single-select-trigger-icon-button {
+  font-size: 16px;
+}
 .bi-single-slider-label {
   min-height: 50px;
 }

dist/widget.css

@@ -548,6 +548,12 @@
   box-sizing: border-box;
   /*W3C标准(IE9+，Safari5.1+,Chrome10.0+,Opera10.6+都符合box-sizing的w3c标准语法)*/
 }
+.bi-single-select-combo .single-select-trigger-icon-button {
+  font-size: 16px;
+}
+.bi-single-select-combo .single-select-trigger-icon-button {
+  font-size: 16px;
+}
 .bi-single-slider-label {
   min-height: 50px;
 }

src/css/widget/singleselect/multiselect.combo.css

@@ -0,0 +1,3 @@
+.bi-single-select-combo .single-select-trigger-icon-button {
+  font-size: 16px;
+}

src/css/widget/singleselect/multiselect.css

@@ -0,0 +1,3 @@
+.bi-single-select-combo .single-select-trigger-icon-button {
+  font-size: 16px;
+}

src/less/widget/singleselect/multiselect.combo.less

@@ -0,0 +1,7 @@
+@import "../../index";
+
+.bi-single-select-combo{
+  & .single-select-trigger-icon-button{
+    font-size: 16px;
+  }
+}