.button_phone{
    position: fixed;
    bottom: 120px;
    display: block;
    right: 22px;
    background-color: #dc3545;
    width: 56px;
    height: 56px;
    transition: all .3s ease-in-out;
    color: white;
    font-size: 30px;
    padding: 12px;
    line-height: 0;
    border-radius: 50%;
    opacity: 0;
}

.button_phone:hover,
.button_phone:active,
.button_phone:focus
{color: white;}

.button_phone:hover {
    -webkit-transform: scale(1.2);
    -ms-transform: scale(1.2);
    transform: scale(1.2);
    transition: 0.2s;
}

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {

}

/* Medium devices (tablets, 768px and up)*/
@media (min-width: 768px) {

}

/* Large devices (desktops, 992px and up)*/
@media (min-width: 992px) {

}

/* X-Large devices (large desktops, 1200px and up)*/
@media (min-width: 1200px) {

}

/* XX-Large devices (larger desktops, 1400px and up)*/
@media (min-width: 1400px) {
    .button_phone{
        right: 10%;
    }
}