colorview

https://colorview.surge.sh

Examples to try:

• CSS names: red, navy, etc.
• Hex values: #efd8a2 or without the # like efd8a2.
• Hex values with alpha: #deadbeef
• CSS rgb: rgb(123, 32, 95) and variations like rgb(32%, 42%, 6.4%)
• CSS rgba: rgba(90, 210, 40, 0.6)

Your browser will be doing the heavy lifting, so any color value supported by your browser's CSS should work.