优化样式

src/less/base/single/button/button.half.less

@@ -2,10 +2,11 @@
 
 .bi-half-button {
   .border-radius(2px);
+  box-sizing: border-box;
   &:after {
     position: absolute;
-    left: 3px;
-    top: 3px;
+    left: 2px;
+    top: 2px;
     width: 8px;
     height: 8px;
     background-color: @color-bi-background-highlight;

src/less/base/single/input/checkbox.less

@@ -4,6 +4,7 @@
   & .checkbox-content, &.checkbox-content {
     .border-radius(2px);
     border: 1px solid @color-bi-border-dark-line;
+    box-sizing: border-box;
     &:after {
       position: absolute;
       display: table;
@@ -12,8 +13,8 @@
       border: 2px solid transparent;
       border-top: 0;
       border-left: 0;
-      width: 4px;
-      height: 8px;
+      width: 6px;
+      height: 9px;
       .transform(rotate(45deg) scale(1) translate(-50%, -50%));
       content: '';
     }

src/less/base/tree/ztree.less

@@ -108,6 +108,7 @@
 .ztree li span.button.chk {
   &.bi-checkbox {
     border: 1px solid @color-bi-border-dark-line;
+    box-sizing: border-box;
     &.active {
       background-color: @color-bi-background-highlight;
       border-color: @color-bi-border-highlight;;
@@ -115,6 +116,7 @@
   }
   &.bi-half-button {
     border: 1px solid @color-bi-border-highlight;
+    box-sizing: border-box;
   }
 }