body{
margin:0;
padding:20px;
font-family:Arial,sans-serif;
background:#f3f4f6;
}

.container{
max-width:700px;
margin:auto;
background:white;
padding:30px;
border-radius:15px;
box-shadow:0 5px 20px rgba(0,0,0,.1);
}

h1{
text-align:center;
margin-bottom:10px;
}

p{
text-align:center;
color:#666;
}

.upload-box{
margin:30px 0;
text-align:center;
}

.upload-box input{
padding:15px;
width:100%;
max-width:500px;
border:2px dashed #2563eb;
border-radius:12px;
background:#fafafa;
}

.preview-box{
margin:20px 0;
padding:15px;
background:#f8f8f8;
border-radius:10px;
text-align:center;
}

#convertBtn,
#downloadBtn{
display:block;
width:100%;
padding:15px;
margin-top:20px;
border:none;
border-radius:10px;
font-size:18px;
font-weight:bold;
cursor:pointer;
text-decoration:none;
text-align:center;
}

#convertBtn{
background:#2563eb;
color:white;
}

#convertBtn:hover{
background:#1d4ed8;
}

#downloadBtn{
background:#16a34a;
color:white;
}

#downloadBtn:hover{
background:#15803d;
}

@media(max-width:768px){

.container{
padding:20px;
}

}