body {
    font-family: Arial, sans-serif;
    background-color: #f8f9fa;
}

.nav-tabs {
    margin-bottom: 20px;
}

.tab-content {
    padding: 20px;
    border: 1px solid #dee2e6;
    border-radius: 0.25rem;
    background-color: #ffffff;
}

.table {
    margin-top: 20px;
}

.table th, .table td {
    text-align: center;
}

.btn {
    margin-top: 10px;
}

.form-select {
    appearance: none;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" fill="currentColor"><path d="M1.5 5.5l6.5 6.5 6.5-6.5"/></svg>');
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1rem;
    padding-right: 2.5rem;
  }