.whatsapp-button, .second-button {
    position: fixed;
    bottom: 10px;
    width: 40%;
    height: 50px;
    display: inline-block;
    float: left;
    text-align: center;
    line-height: 50px;
    z-index: 9999;
}

.whatsapp-button {
    right: 20px;
    background-color: green;
    color: #fff;
    border-radius: 10px;
}

.second-button {
    left: 20px;
    background-color: blue;
    color: #fff;
    border-radius: 10px;
}