アンカーポイントにスクロールする

<div style="position: fixed;">
  <button onclick="redDown()">RED</button>
  <button onclick="greenDown()">GREEN</button>
  <button onclick="blueDown()">BLUE</button>
</div>
<div id="red" style="background-color: red;height: 100vh;"></div>
<div id="green" style="background-color: green;height: 100vh;"></div>
<div id="blue" style="background-color: blue;height: 100vh;"></div>

function redDown() {
  location.hash = "red";
}

function greenDown() {
  location.hash = "green";
}

function blueDown() {
  location.hash = "blue";
}