.message {
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 15px;
    font-weight: bold;
    color: #fff;
    text-align: center;
}

.message.success { background-color: #28a745; }    /* Green */
.message.error   { background-color: #dc3545; }    /* Red */
.message.info    { background-color: #007bff; }    /* Blue */
.message.warning { background-color: #ffc107; color: #212529; }  /* Yellow */