*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:Arial, sans-serif;
}

body{
background:#f4f6f8;
padding:30px;
}

.container{
max-width:800px;
margin:auto;
background:white;
padding:20px;
border-radius:10px;
box-shadow:0 0 10px rgba(0,0,0,.1);
}

h1{
margin-bottom:20px;
text-align:center;
}

.progress{
width:100%;
height:25px;
background:#ddd;
border-radius:20px;
overflow:hidden;
margin:15px 0;
}

#progressBar{
height:100%;
width:0%;
background:#28a745;
transition:.3s;
}

.topic{
padding:10px;
margin:5px 0;
border-bottom:1px solid #eee;
}

input{
width:100%;
padding:10px;
margin-top:10px;
}

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

button:hover{
background:#0056b3;
}