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const container = document.getElementById('element');

generateRandomColor();

function generateRandomColor() {
  // 16777215 is decimal equivalent of FFFFFF in hexadecimal
  const randomHex = Math.floor(Math.random() * 16777215).toString(16);
  container.style.backgroundColor = `#${randomHex}`;
  container.innerHTML = `#${randomHex}`;
}

.container {
  height: 100px;
  width: 100%;
  border: 1px solid black;
  margin-bottom: 5px;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: bold;
  font-size: 24px;
}

<div id="element" class="container"></div>
<button onclick="generateRandomColor()">Generate Random Color</button>