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function setColour(colour) {
if ((colour === "black" || colour === "white") || ((colour !== "blue") && (colour !== "green") && (colour !== "red") && (colour !== "yellow"))) {
colour = "red";
}
localStorage.setItem("colour",colour);
var root = document.querySelector(":root");
var rootstyle = getComputedStyle(root);
const colourValue = rootstyle.getPropertyValue("--" + colour);
root.style.setProperty("--colour",colourValue);
}
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