/*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>