html button onclick open in new tab

best html button in scc

<style> 
.serv-price .price-button {
     cursor: pointer;
    width: 80%;
    padding: 10px 15px;
    border: 0;
    text-align: center;
    color: #fff;
    font-weight: 700;
    background: #8EE000;
    margin: 70px 0 15px;
    border-radius: 4px;
    transition: .3s;
    border-bottom: solid 3px #7AC70C
}
.serv-price .price-button.active {
    background: #14D4F4;
    border-bottom: solid 3px #1CB0F6;
}
.serv-price .price-button.active:hover {
    border-bottom: solid 3px #14D4F4;
}
 </style>

 <div class="serv-price">
<button button="" class="price-button lgb active" onclick="window.open('http://covelign.com/4Tpw')" style="height: 40px; width: 30%;">Download</button></div>
  </div>