main {
    width: 900px;
    padding: 40px;
    margin: 150px calc(50% - 450px);
    background-color: #fff;
}
footer {
    position: fixed;
    bottom: 0;
    left: 0;
}

.body-contact .termns-box span {
    color: #111;
}

@media (max-width: 991px) {
    main {
        width: 98vw;
        margin: 150px 1vw;
        padding: 40px 2vw;
    }
}