[Plugin: Slick Contact Forms] vertical text

hi all,

i would like to have a vertical text when using this widget.

i followed the instructions here:
https://www.designchemical.com/blog/index.php/faq/adding-vertical-text-to-the-contact-form-tab/
the code i added was:-

.dc-contact-slick .tab {
background: url(https://rapscallion.eu/wp-content/uploads/2011/08/contact.png) no-repeat 0 0;
width: 40px;
height: 120px;
padding: 0!important;
}

now i dont see anything at all, but if i change the skin from ‘no theme’ to anything else, i see the widget, but with no vertical image.

however, the image is being loaded to the website. if i disable margin left, i can see the image. see screenshot:-
https://cl.ly/0D332W3j3R3H222m2G26