Hello,
I use your url link to see your page example, and I don't see your custom css code as shown
here
in the tutorial :
.hikashop_product_characteristics_table td .inputbox {display: none;}
.hikashop_product_characteristics_table td img {border: 2px groove black;}
.hikashop_product_characteristics_table td label {display:inline !important; padding-left: 5px;}
From this, did you add the custom css code to your frontend css file, AND did you select this custom css file as "Front-end CSS File".
Hope this will help you.
Regards