@media only screen and (max-width: 600px) {
    .login-wrap {
margin: initial;
background: url(images/bg-login.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: top center;

    }
    .login-wrap:after{
        content: "";
        position: absolute;
        width: 100%;
        height: 100%;
        background-color: #fff;
        opacity: .9;
    }
    .logo_login{
        margin: 0 auto;
        max-width: 230px;
    }
    .login-block{
        margin: 0 20px ;
    }
    .pegadas{max-width: 200px;}
  }