To style file upload buttons on your online form, access the form’s Edit options and go to the Themes section. Afterwards, click on Add custom CSS and paste this ID to style the file upload default text:
#form div[data-ui-role=ui-element][data-type=file] > div[data-role=upload-overlay] > div[data-role=placeholder]
Below are some examples:
#form div[data-ui-role=ui-element][data-type=file] > div[data-role=upload-overlay] > div[data-role=placeholder] { color:#4169E1; }
Replace #4169E1 with the hexcode corresponding to the color you want.
#form div[data-ui-role=ui-element][data-type=file] > div[data-role=upload-overlay] > div[data-role=placeholder] {content: url('//mydomain.com/upload.png');}
Replace //mydomain.com/upload.png with the URL where your image is located.
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