Firstly go to the "Online store" section of admin, and select themes. 

Select edit code

Scroll to assets and select theme.scss.liquid

Be sure to copy and save the code first in a text file on your computer

Now scroll to the bottom of code and copy and paste the following CSS

.Esc-returns-container input[type="radio"] {    -moz-appearance: radio;    -webkit-appearance: radio;    appearance: radio;}

Please don't hesitate to ask if you need any assistance 

Did this answer your question?