app/ui/main.css

.main-title {
    font-size: 3em;
    font-weight: bold;
    margin-top: 20px;
    text-align: center;
    color: #007bff;
}
.sub-header {
    font-size: 1.5em;
    margin: 20px 0;
    text-align: center;
    color: #333;
}