// Javascript

// Get reference to all 'path'
const paths = document.querySelectorAll('svg path');

const setColor = (element) => {
    // Assign currently selected color in --svg-fill-color to 'fill' of clicked 'path'
    element.style.fill = getComputedStyle(document.body).getPropertyValue("--svg-fill-color");
};

// Assign event listener to all 'path'
paths.forEach((path, index)=>{
    // Executes 'setColor(..)' when path is clicked
    path.addEventListener("click", (event) => { setColor(event.target) });
});

/* CSS */

body { --svg-fill-color: black } /* default black */

<!-- HTML -->

<label for="color">
    <input id="color" type="color"
           oninput="document.body.style.setProperty('--svg-fill-color', this.value);">
    Path Color
</label>

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