.whatsapp {
position: fixed;
right: 30px;
bottom: 30px;
z-index: 99999;
}

.whatsapp a {
font-size: 28px;
color: #fff;
width: 60px;
height: 60px;
border-radius: 50px;
text-align: center;
line-height: 60px;
display: block;
background-color: #00e675;
box-shadow: 0 3px 12px #00000040;
transition: 0.3s;
}

.whatsapp a:hover {
background-color: #118c7e;
}