body.login {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-pack: center;
    justify-content: center;
    width: 100%;
    background-image: none;
}

.mywplogin-second-section, .mywplogin-firt-section {
    width: 50%;
}

@media screen and (max-width: 768px) {
    body.login {
        display: block;
    }
    .mywplogin-firt-section {
        display: none;
    }
    .mywplogin-second-section {
        width: 100%;
    }
}