Resize WhatsApp logo button

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;
}