.alert {
    padding: 1em;
    border-radius: 4px;
    position: relative;
}
.alert .close {
    position: absolute;
    top: 0.5em;
    right: 0.75em;
    color: inherit;
}
.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}
.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-color: #c3e6cb;
}
.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border-color: #ffeeba;
}
.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-color: #bee5eb;
}