You can change the CSS
.whatsappme__button svg {
width: 36px;
height: 36px;
margin: 12px 12px;
transform: scale(0.8);
background-color: #25d366;
color: #fff;
border-radius: 30px;
padding: 1px;
.whatsappme__button {
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
position: absolute;
z-index: 2;
bottom: 8px;
right: 8px;
height: 60px;
min-width: 60px;
max-width: 95vw;
cursor: pointer;
transition: background-color .2s linear;
-webkit-tap-highlight-color: transparent;
}