@media (max-width: 1199px) and (min-width: 992px) {
    .contact .contact_list input.button {
        width:100%;
        height: 30px;
        margin: 7px 0 0 0;
        background: #2a2a2a;
        color: #fff;
        text-align: center;
        border: none;
        cursor: pointer;
    }
}
@media (max-width: 992px) and (min-width: 678px) {
    .contact .contact_list input.button {
        width:100%;
        height: 30px;
        margin: 7px 0 0 0;
        background: #2a2a2a;
        color: #fff;
        text-align: center;
        border: none;
        cursor: pointer;
    }
}