/* init */
.dd-clear { zoom:1; }
.dd-clear:after { content:''; display:block; clear:both; }
.dd-fl { float:left; }
.dd-fr { float:right; }


.dd-row{
}

.dd-column{
    display: flex;
    flex-direction: column;
}

/*贴在最下面  */
.dd-fixed-bottom{
  position: fixed;
  bottom: 0;


}
/*贴在最上面  */
.dd-fixed-top{
    position: fixed;
    top: 0;
    width: 100%
}
/* end init */