How do you save a change to CSS, using local storage?

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I followed a YouTube tutorial to create a button on my website – when you click the button, the background color changes. However, this change does not remain when the page is refreshed or when another page is visited. I have tried to save this using LocalStorage, but have not been able to figure it out. I am hoping to have some help figuring out how to use Local Store to save this change to my CSS. Thank you!

What I have tried:

This is my Javascript:

JavaScript

var color = ["#ad9ea1", "#8e96a3", "#94a899", "#cfc5b6", "#91919c", "#b3b4b5"];
var i = 0;
document.querySelector("button").addEventListener("click", function() {
  i = 0 <= color.length ? ++i : 0;
  document.querySelector(".caro").style.background = color[i];
  if (i == 5) {
    i = 0;
  }
})

Posted 7-Dec-20 14:43pm

K 8260

Updated 7-Dec-20 23:28pm

v2

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Richard Deeming · Accepted Answer · 2020-12-07T23:28:00

Window.localStorage - Web APIs | MDN[^]

JavaScript

const colors = ["#ad9ea1", "#8e96a3", "#94a899", "#cfc5b6", "#91919c", "#b3b4b5"];
let colorIndex = parseInt(localStorage.getItem("colorIndex")) || 0;

const updateColor = function() {
    document.querySelector(".caro").style.background = colors[colorIndex];
};

document.querySelector("button").addEventListener("click", function() {
    ++colorIndex;
    if (colorIndex >= colors.length) {
        colorIndex = 0;
    }

    localStorage.setItem("colorIndex", colorIndex);
    updateColor();
});

updateColor();

Demo[^]