Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve products/assets/todo-marker-ccf30c6d95b56ca3d0f1d359619ebfa6.css, which is not a DOI.
products/assets/todo-marker-ccf30c6d95b56ca3d0f1d359619ebfa6.css may be a Handle (DOIs are a special sort of Handle). If products/assets/todo-marker-ccf30c6d95b56ca3d0f1d359619ebfa6.css is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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