If you want to do it in HTML then the following will do it. I've left the colours a bit garish because you will probably want to change them.
<!DOCTYPE html>
<html>
<head>
<style>
.Customerbutton {
border: none;
color: red;
padding: 16px 32px;
text-align: left;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
transition-duration: 0.4s;
cursor: pointer;
border-radius: 9px;
}
.Customerbutton1 {
background-color: red;
color: black;
border: 2px solid #04AA6D;
}
.Customerbutton1:hover {
background-color: #04AA6D;
color: white;
}
</style>
</head>
<body>
<a target="_blank" href="https://google.com" class="Customerbutton Customerbutton1" style="text-decoration:none">Go to Google</a>
</body>
</html>