body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    margin: 0;
    padding: 100px 20px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

h1 {
    text-align: center;
    color: #333;
}

form {
    display: flex;
    flex-direction: column;
}

input[type="file"] {
    margin-bottom: 10px;
}

button {
    padding: 10px 20px;
    background-color: #007bff;
    color: #fff;
    border: none;
    cursor: pointer;
}

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

#processingMsg {
    text-align: center;
}


.hidden {
    display: none;
}

#downloadBtn {
    border-box: 5px;
    margin-top: 20px;
}

#downloadBtn button {
    border-box: 5px;
    padding: 10px 20px;
}

.options-container {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.option {
    margin-right: 20px;
    margin-bottom: 10px;
}

.option label {
    margin-left: 5px;
}

.options-wrapper {
    background-color: #f2f2f2;
    border-radius: 8px;
    padding: 20px;
    margin-top: 20px;
}

#checkbox-heading {
    text-align: center;
    font-size: 16px;
    margin-bottom: 10px;
}

#explanation-note {
    text-align: center;
    margin-top: 20px;
    font-style: italic;
}

#submitBtn {
    margin-top: 20px;
    border-radius: 5px;
}

.spinner {
     border: 4px solid rgba(0, 0, 0, 0.1);
     border-left-color: #333;
     border-radius: 50%;
     width: 50px;
     height: 50px;
     animation: spin 1s linear infinite;
     margin: 20px auto;
}

@keyframes spin {
     0% { transform: rotate(0deg); }
     100% { transform: rotate(360deg); }
}