body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #121212;
    color: #ffffff;
}

#date-picker {
    margin-bottom: 20px;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
}

#date-picker label {
    color: #ffffff;
    margin-right: 10px;
}

#date-input {
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #fff;
    color: #000;
}

#add-date-button {
    padding: 10px 15px;
    font-size: 16px;
    border: none;
    border-radius: 5px;
    background-color: #007bff;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-left: 10px;
}

#add-date-button:hover {
    background-color: #0056b3;
}

#date-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.day {
    background-color: #1e1e1e;
    border-radius: 10px;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    transition: background-color 0.3s ease;
}

.day:hover {
    background-color: #1e1e1e;
}

.day-date {
    font-weight: bold;
    font-size: 18px;
}

.name-buttons {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

.name-button {
    padding: 5px 10px;
    border: none;
    background-color: #333333;
    color: white;
    cursor: pointer;
    border-radius: 3px;
    transition: background-color 0.3s ease;
}

.name-button:hover {
    background-color: #444444;
}

.name-button.active {
    background-color: #4CAF50;
}

.name-button.active:hover {
    background-color: #45a049;
}

.remove-date {
    cursor: pointer;
    color: #ff4444;
    transition: color 0.3s ease;
}

.remove-date:hover {
    color: #ff0000;
}

.error {
    text-align: center;
    padding: 20px;
    background-color: #1e1e1e;
    border-radius: 10px;
    margin-top: 20px;
    color: #ff4444;
}