body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin-left: 20px;
    margin-right: 20px;
}

main {
    flex-grow: 1;
}

.mb-4 {
    margin-bottom: 0px !important;
}

.flash-messages {
    margin: 20px 0;
}

.alert {
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 4px;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
}

.username-info-header {
    margin-right: 1rem;
}

@media (max-width: 768px) {
    body {
        font-size: 14px;
    }

    h1 {
        font-size: 20px;
    }

    .btn {
        font-size: 12px;
        padding: 8px 16px;
    }
}