html, body {
    height: 100%;
    margin: 0;
}

body {
    display: flex;
    justify-content: center; /* horizontal center */
    align-items: center; /* vertical center */
    background-color: #f4f6f9;
}

/* Wrapper */
.login-wrapper {
    width: 100%;
    max-width: 420px;
    padding: 30px;
    background: #ffffff;
    border-radius: 3px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

/* Brand */
.brand {
    text-align: center;
    margin-bottom: 20px;
}

.brand img {
    width: 100px;
    margin-bottom: 10px;
}

/* Button full width */
.btn-block {
    width: 100%;
}

/* Responsive spacing */
@media (max-width: 576px) {
    .login-wrapper {
        padding: 20px;
        margin: 15px;
    }
    .login-header{
        font-size:23px;
    }
    .brand img {
        width: 80px;
    }

}