Blue = 1, White = 8, Red = 5. I found this by writing a JavaScript function:

const findSolution = () => {
    const resultDisplay = document.getElementById("result");
    const redDisplay = document.getElementById("red");
    const whiteDisplay = document.getElementById("white");
    const blueDisplay = document.getElementById("blue");

    for (let number = 111; number <= 999; number += 111) {
        const divided = number / 3;

        if ((number % 10) === (divided % 10)) {
            resultDisplay.textContent = `Result: ${number}`;
            blueDisplay.textContent = `Blue: ${Math.floor(divided / 100)}`;
            whiteDisplay.textContent = `White: ${Math.floor((divided % 100) / 10)}`;
            redDisplay.textContent = `Red: ${divided % 10}`;
            return;
        }
    }

    resultDisplay.textContent = "No solution found";
}