Sorry...
this is the input
<input id="data_sortida" required name="sortida" class="c_data" size="16" type="text" placeholder="<?=$data2?>" ></input>
and the styles
.c_data{background:url('img/calendari.png') no-repeat 96% center / 17px 17px, url('img/textures/clar.png') repeat;padding-left: 6px;width: 300px;}