body {
    font-family: Arial, sans-serif;
    margin: 20px;
}

h1, h2 {
    font-family: Arial, sans-serif;
}

table {
    border-collapse: collapse;
    margin-top: 10px;
}

th {
    background-color: #f0f0f0;
}

td, th {
    padding: 5px 8px;
}

.alert {
    padding: 8px 10px;
    margin-bottom: 10px;
    border-radius: 4px;
}

.alert-success {
    background-color: #d6f5d6;
    border: 1px solid #3c763d;
    color: #3c763d;
}

.alert-error {
    background-color: #f8d7da;
    border: 1px solid #a94442;
    color: #a94442;
}

form div {
    margin-bottom: 8px;
}
tr.row-used {
    background-color: #f9e6e6;
}