Code for Button

<button onclick="topFunction()" id="myBtn" title="Go to top">▲</button>

<style>

#myBtn {

position:relative;

top:50%;

left:47.5%;

position: bottom;

display: flex;

align-items: center;

justify-content: center;

z-index: 99;

font-size: 18px;

border: #111;

outline: none;

background-color: #555;

color: #FFFFFF;

cursor: pointer;

padding-top: 10px;

padding-bottom: 10px;

padding-right: 20px;

padding-left: 20px;

border-radius: 40px;

}

#myBtn:hover {

background-color: #111;

</style>

<script>

function topFunction() {

document.documentElement.scrollTop = 0;

}

</script>