body {
font-family: Arial, sans-serif;
background-color: #4d7464;
margin: 0;
padding: 0;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0 10px;
}

.container {
background: white;
padding: 20px 50px;
border-radius: 8px;
box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
text-align: center;
min-height: 44vh;
display: flex;
align-items: center;
justify-content: center;
flex-direction: column;
}

h1 {
margin-bottom: 20px;
}

form {
margin-bottom: 20px;
}

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

button {
padding: 10px 20px;
border: none;
background-color: #007bff;
color: white;
border-radius: 5px;
cursor: pointer;
font-size: 20px;
}

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

#progress .loader {
border: 16px solid #f3f3f3;
border-top: 16px solid #007bff;
border-radius: 50%;
width: 120px;
height: 120px;
animation: spin 2s linear infinite;
margin: 0 auto;
}
input#audioFile {
opacity: 0;
width: 100%;
height: 100px;
}
span.upload_file {
display: block;
margin: 20px auto;
background: url("file_audio.webp") no-repeat;
background-size: contain;
background-position: center center;
cursor: pointer;
}
span.upload_file.file-selected {
background: url("file_audio_selected.webp") no-repeat;
background-size: contain;
background-position: center center;
}
div#export-options button {
    min-width: 200px;
    display: inline-block;
    margin: 10px auto;
    font-size: 18px;
}
@keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}