Fix bugs on text fields

Prevent pressing the Enter key from resetting the user-chosen color when either the CSS color code field or the HEX code field is focused (#166)

Disable the native browser form validation so the user won't see duplicated error messages when their input values are invalid (#191).

Error messages and 3-digit HEX code

New features

1. Error messages show up when the user enters an invalid value, instructing how to correct it (#27)
2. The 3-digit HEX color code is now accepted (#186).

Fix a UI bug

Prevent the page from being horizontally scrollable for mobile device screens, to improve the user experience of scrolling the page vertically (#178)

Fix minor UI layout issues

Fix #57 and #170 which can negatively affect user experiences.

Initial release

docs(package.json): change the version to be 1.0.0

declare the initial release