.alert {
    padding: 20px;
    background-color: #f44336;
    color: white;
    opacity: 1;
    transition: opacity 0.6s;
    margin-bottom: 15px;
}

.alert.success {background-color: #4CAF50;}
.alert.info {background-color: #2196F3;}
.alert.warning {background-color: #ff9800;}