修复css bug

修复.btn-group在.btn-group-justified的表现问题

css/style.min.css

@@ -2061,7 +2061,8 @@ fieldset[disabled] .btn-dark:hover {
     -webkit-box-pack: justify;
     justify-content: space-between;
 }
-.btn-group-justified .btn {
+.btn-group-justified .btn,
+.btn-group-justified .btn-group {
     width: 100%;
 }
 .btn-group-round .btn:first-child {