body{
    background: url("img/login_bg.png") no-repeat center center fixed;
    background-size: cover;
}
.error{
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
    list-style-type: none;
    position: relative;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 0.25rem;
}