/*父  100*/.parent-div {/* 这里添加你想要的属性 */display: flex;flex-direction: row; //行justify-content: space-between; //左右对齐align-items: center;flex-wrap: wrap; //换行}/*中 90 +10 */.middle-div {/* 这里添加你想要的属性 */display: flex;flex-direction: row;align-items: center;flex-wrap: wrap;}/*子 每一个小div */.son-div {/* 这里添加你想要的属性 */flex-direction: row;margin: 5px 10px;}

<div class="form-group parent-div"   ><div class="middle-div" style="width: 90%; justify-content: left;"><div class="son-div"><a  class="search-button"  >导出</a></div><div class="son-div"><input type="text" id="dc_ids"   class="form-control" style="width: 185px;" ></div>                         </div><div class="middle-div"  style="width: 10%;justify-content: right;flex-direction: row"><div class="son-div"><a  class="search-button"  >读卡</a></div><div class="son-div"><a  class="search-button"  >查询</a></div></div></div>