#dv-calculadora {
  max-width: 520px;
  margin: 40px auto;
  padding: 30px;
  background: #ffffff;
  border-radius: 10px;
  box-shadow: 0 8px 25px rgba(0,0,0,0.1);
  font-family: Arial, sans-serif;
}

#dv-calculadora h2{
  text-align:center;
  margin-bottom:20px;
}

#dv-calculadora label{
  display:block;
  margin-top:15px;
  font-weight:bold;
}

#dv-calculadora input{
  width:100%;
  padding:8px;
  margin-top:5px;
  border-radius:6px;
  border:1px solid #ccc;
}

#dv-calculadora button{
  width:100%;
  margin-top:20px;
  padding:12px;
  background:#2e7d32;
  color:white;
  border:none;
  border-radius:6px;
  font-size:16px;
  cursor:pointer;
}

#dv-calculadora button:hover{
  background:#1b5e20;
}

.dv-resultado{
  margin-top:25px;
  padding:15px;
  background:#f5f5f5;
  border-radius:6px;
  font-size:15px;
}