css如何超出显示滚动条

 <div class="outer-container">
     <div class="inner-container">
        <div class="content">
            ......
        </div>
     </div>
 </div>
.element, .outer-container {
  width: 200px;
  height: 200px;
}
.outer-container {
  border: 5px solid purple;
  position: relative;
  overflow: hidden;
}
.inner-container {
  position: absolute;
  left: 0;
  overflow-x: hidden;
  overflow-y: scroll;
}
.inner-container::-webkit-scrollbar {
  display: none;
}

1
.element::-webkit-scrollbar { width: 0 !important }
　　IE 10+
1
.element { -ms-overflow-style: none; }
　　Firefox
1
.element { overflow: -moz-scrollbars-none; }

::-webkit-scrollbar { /* 1 */ }
::-webkit-scrollbar-button { /* 2 */ }
::-webkit-scrollbar-track { /* 3 */ }
::-webkit-scrollbar-track-piece { /* 4 */ }
::-webkit-scrollbar-thumb { /* 5 */ }
::-webkit-scrollbar-corner { /* 6 */ }
::-webkit-resizer { /* 7 */ }