body {
  background-image: url("fondo2.jpg");
}

#tamaño {
  width: 550px;
  height: 650px;
  border:  none;
  padding:  10px 10px 3px 15px;
  margin: 0 auto;
  margin-top: 100px;
  overflow: hidden;
}

#display {
  width: 490px;
  height: 45px;
  background-color: white;
  margin-left: 20px;
  margin-right: 15px;
  margin-top: 20px;
  margin-bottom: 40px;
  text-align: right;
  font-size: 40px;
  font-family: Courier New;
  padding: 10px;
  overflow: hidden;      
}

.boton {
  width: 120px;
  height: 100px;
  margin-bottom: 5px;
  margin-right: 4px;
  background-color: #ffffff;
  cursor: pointer;
  text-align: center;
  font-family: Courier New;
  font-size: 30px;
  border: none;
  box-shadow: 2px 2px 10px #666,
               5px -5px 0 2px #444,
               5px 5px 25px #222;
}
.digito {
  width: 120px;
  height: 100px;
  margin-bottom: 5px;
  margin-right: 4px;
  background-color: #ffffff;
  cursor: pointer;
  text-align: center;
  font-family: Courier New;
  font-size: 30px;
  border: none;
  box-shadow: 2px 2px 10px #666,
               5px -5px 0 2px #444,
               5px 5px 25px #222;
}
.operacion {
  width: 120px;
  height: 100px;
  margin-bottom: 5px;
  margin-right: 4px;
  background-color: #ffffff;
  cursor: pointer;
  text-align: center;
  font-family: Courier New;
  font-size: 30px;
  border: none;
  box-shadow: 2px 2px 10px #666,
               5px -5px 0 2px #444,
               5px 5px 25px #222;
}
#igual{
    width: 120px;
    height: 100px;
    margin-bottom: 5px;
    margin-right: 4px;
    background-color: #ffffff;
    cursor: pointer;
    text-align: center;
    font-family: Courier New;
    font-size: 30px;
    border: none;
    box-shadow: 2px 2px 10px #666,
                 5px -5px 0 2px #444,
                 5px 5px 25px #222;
}
#punto{
  width: 120px;
    height: 100px;
    margin-bottom: 5px;
    margin-right: 4px;
    background-color: #ffffff;
    cursor: pointer;
    text-align: center;
    font-family: Courier New;
    font-size: 30px;
    border: none;
    box-shadow: 2px 2px 10px #666,
                 5px -5px 0 2px #444,
                 5px 5px 25px #222;
}
#borrar{
  width: 120px;
    height: 100px;
    margin-bottom: 5px;
    margin-right: 4px;
    background-color: #ffffff;
    cursor: pointer;
    text-align: center;
    font-family: Courier New;
    font-size: 30px;
    border: none;
    box-shadow: 2px 2px 10px #666,
                 5px -5px 0 2px #444,
                 5px 5px 25px #222;
}
.tanto, .raiz{
  width: 120px;
    height: 100px;
    margin-bottom: 5px;
    margin-right: 4px;
    background-color: #ffffff;
    cursor: pointer;
    text-align: center;
    font-family: Courier New;
    font-size: 30px;
    border: none;
    box-shadow: 2px 2px 10px #666,
                 5px -5px 0 2p
}

.Filas {
  margin-left: 20px;
  margin-right: 15px;
}