How to make a colored scoreboard header in minecraft

This is pretty easy and straightforward, since the command accepts JSON in 1.13.

/scoreboard objectives modify <your objective> displayname {"text":"<your title>", "color":"<your color>"}

Or you can as well add a new objective:

/scoreboard objectives add <name> <type> {"text":"<your title>", "color":"<your color>"}

In the example I've used this command:

/scoreboard objectives add MoreDeaths deathCount {"text":"More Deaths", "color":"yellow"}

These will result in this: Objective

This is a team color. You need a team with that color and the scoreboard holder has to join that team:

/team add teamName
/team modify teamName color blue
/team join teamName <selector>

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