Change paragraph color upon button click.

HTML

<p class="ss">Paragraph 1</p> 
<p class="ss">Paragraph 2</p>
<p class="ss">Paragraph 3</p>

<button onclick="changeAll()">Change All</button>

JavaScript

function changeAll() {
    // Select via CLASS (. as prefix)
    let allPara = document.querySelectorAll(".ss");
    allPara.forEach(function(p) {
        let randomColor = "#" + Math.floor(Math.random() * 16777215).toString(16);
        p.style.color = randomColor;
    });
}