In order to get a simple button with a hover effect simply use the following script

<center
style="
background-color:#f7f7f7;
       width: 100%;
       padding: 30px;">
       
   <button
   onclick="
    amazd.show();amazd.toggle()"
onMouseOver="
       this.style.background='black';
       this.style.color='white'"
onMouseOut="
       this.style.background='#f7f7f7';
       this.style.color='black'"
style="
    cursor: pointer;
    background: #f7f7f7;
    color: #000000;
    border: solid;
    border-radius: 0px;
    border-color:#000000;
    font-family:CeraPro;
       font-size:14px;">
   <b>GET IN TOUCH</b>
   </button>
</center>

Here you find an example button: