.alert {
    position: relative;
    padding: 1rem 1rem;
    border: 1px solid transparent;
    border-radius: .25rem;
    box-sizing: border-box;
    display: block;
}

.alert-warning {
    width: 90%;
    margin: 0 auto 1.5rem;
    color: #664d03;
    background-color: #fff3cd;
    border-color: #ffecb5;
}