main {
    margin-top: 50px;
}

.login {
    background-color: #f5f5f5;
}

.img-responsive {
    margin: 0 auto;
}

.logo {
    width: 100px;
}

.col-login {
    position: fixed;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

.login .panel {
    box-shadow: none;
}
.login .panel-default {
    border: none;
}

.login .panel-default {
    background-color: transparent;
}

.login .panel-body, .login .panel-heading {
    border: none;
}

.btn-buffer {
    margin-top: 25px;
    margin-bottom: 50px;
}