uc浏览器中overflow:hidden不起作用么？

#slider {
  width: 140px;
  height: 50px;
  overflow: hidden;
  position: relative;
  margin: 10px auto;
  border: 1px solid #000; 
}
  #slider .slider-inner {
    height: 100%;
    width:2000px;
    transition: all .3s;
   }

为什么在UC浏览器中不起作用呢？