Tạo Contact Button đẹp cho website sử dụng HTML và CSS

<div class=“echbay-sms-messenger style-for-position-br”>
<div class=“phonering-alo-alo”>
<a href=“tel:0972939830” rel=“nofollow” class=“echbay-phonering-alo-event”>.</a>
</div>
<div class=“phonering-alo-sms”>
<a href=“sms:0972939830” rel=“nofollow” class=“echbay-phonering-sms-event”>.</a>
</div>
<div class=“phonering-alo-zalo”>
<a href=“https://zalo.me/0972939830” target=“_blank” rel=“nofollow” class=“echbay-phonering-zalo-event”>.</a>
</div>
<div class=“phonering-alo-messenger”>
<a href=“https://www.messenger.com/t/joseph.thien.75” target=“_blank” rel=“nofollow” class=“echbay-phonering-messenger-event”>.</a>
</div>
</div>
<style type=”text/css”>
.echbay-sms-messenger div.phonering-alo-zalo,
.echbay-sms-messenger div.phonering-alo-alo {
background-color:#0084ff
}
.echbay-sms-messenger div.phonering-alo-sms {
background-color:#f60
}
.echbay-sms-messenger div.phonering-alo-messenger {
background-color:#e60f1e
}
.echbay-sms-messenger {
width:45px
}
.echbay-sms-messenger a {
line-height:45px;
        color: transparent;
display:block;
}
.echbay-sms-messenger {
display:block
}
.echbay-sms-messenger div.phonering-alo-zalo {
display: block
}
.echbay-sms-messenger div.phonering-alo-alo {
    background-image: url(https://tintucnhanh.net/wp-content/uploads/2023/04/call.png);
}
.echbay-sms-messenger div.phonering-alo-sms {
    background-image: url(https://tintucnhanh.net/wp-content/uploads/2023/04/mail.png);
    background-color: #f60;
    background-size: 60%;
}
.echbay-sms-messenger div.phonering-alo-zalo {
    background-image: url(https://tintucnhanh.net/wp-content/uploads/2023/04/zalo.png);
}
.echbay-sms-messenger div.phonering-alo-messenger {
    background-image: url(https://tintucnhanh.net/wp-content/uploads/2023/04/messenger.png);
    background-color: #e60f1e;
}
.echbay-sms-messenger div {
    margin: 14px 0;
    background: #0084FF center no-repeat;
    background-size: 70%;
    border-radius: 50%;
    box-shadow: 0 3px 10px #888;
}
.echbay-sms-messenger {
    text-align: center;
    right:20px;
    position: fixed;
    bottom: 20px;
    z-index: 999;
}
</style>