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HTML

              
                <button onclick="addTokenFunction()" class="add">Add DHK To MetaMask</button>
              
            
!

CSS

              
                body
{
  height:100vh;
  display:flex;
  justify-content:center;
  align-items:center;
  overflow:hidden;
  background-color: #000000;
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='250' height='30' viewBox='0 0 1000 120'%3E%3Cg fill='none' stroke='%23222' stroke-width='10' %3E%3Cpath d='M-500 75c0 0 125-30 250-30S0 75 0 75s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3Cpath d='M-500 45c0 0 125-30 250-30S0 45 0 45s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3Cpath d='M-500 105c0 0 125-30 250-30S0 105 0 105s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3Cpath d='M-500 15c0 0 125-30 250-30S0 15 0 15s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3Cpath d='M-500-15c0 0 125-30 250-30S0-15 0-15s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3Cpath d='M-500 135c0 0 125-30 250-30S0 135 0 135s125 30 250 30s250-30 250-30s125-30 250-30s250 30 250 30s125 30 250 30s250-30 250-30'/%3E%3C/g%3E%3C/svg%3E");
}

button
{
  
background: rgb(85,0,255);
background: linear-gradient(90deg, rgba(85,0,255,1) 35%, rgba(214,0,255,1) 100%);
  background-size: 200% 200%;
border:none;
  padding:30px 70px;
  border-radius:40px;
  color:#fff;
  font-size:20px;
  text-transform:uppercase;
    transition:ease-in all .5s;
  animation:button infinite alternate 5s;
}
button:hover
{
  cursor:pointer;
}

@keyframes button
{
  0% {		background-position: 0% 50%;
}
  100% {		background-position: 100% 70%;
}
}
              
            
!

JS

              
                const tokenAddress = '0xe85d2c93f7E26B99a46A8bB9350cBfB965FA4F82';
const tokenSymbol = 'DHK';
const tokenDecimals = 18;
const tokenImage = 'https://decentralizehk.like.community/wp-content/uploads/sites/78/2021/06/cropped-DHK-06-1-270x270.png';

async function addTokenFunction() {

try {
  
  const wasAdded = await ethereum.request({
    method: 'wallet_watchAsset',
    params: {
      type: 'ERC20', 
      options: {
        address: tokenAddress, 
        symbol: tokenSymbol, 
        decimals: tokenDecimals, 
        image: tokenImage, 
      },
    },
  });

  if (wasAdded) {
    console.log('Thanks for your interest!');
  } else {
    console.log('HelloWorld Coin has not been added');
  }
} catch (error) {
  console.log(error);
}
}
              
            
!
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