Change Default Checkbox Logo to Improve UX for Data Importing

[UX - Feedback] TLDR; Change checkbox default logo to white (unchecked) instead of gray (dimmed-style) When importing CSVs or other data to Clay the Column header mapping checkboxes look like they're uncheckable once you click them anyway they turn to blue. Maybe changing the default look would make it easier for user on the UX/UI side. Good example below