body{
    display:flex;
    justify-content: center;
    align-items:center;
    height:100vh;
    background-color:#f0f0f0;
    font-family:Arial, sans-serif;
    margin:0;
}

.converter{
    background-color:#fff;
    padding:20px;
    border-radius:10px;
    box-shadow:0 0 10px rgba(0,0,0,0.1);
    text-align:center;
}

h2{
    margin-bottom:20px;
}

.input-group{
    display:flex;
    flex-direction:column;
    align-items:center;
}

input,
select,
button{
    margin:10px 0;
    padding:10px;
    font-size:16px;
    border:1px solid #ccc;
    border-radius:5px;
}

button{
    background-color:#007bff;
    color:#fff;
    cursor:pointer;
}

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