I had this code before, while it was not working:
.drop_area {
background-color: #fbecce;
border: dashed 1px #6993bb;
font-size: 1.1em;
}
But there was also a mistake about the font-size here:
/* Common button styling. */
.button_submit, .right_submit, .left_submit, .button_reset, .drop_area_fileselect_text,
because it changed to this with 1.1.1:
/* Common button styling. */
input[type="submit"], .drop_area_fileselect_text, button[type="submit"], input[type="button"],