@font-face{
        font-family: Fira Sans;
        src: url(fira-sans/FiraSansOT-Regular.otf) format("opentype");
        font-weight: normal;
        font-style: normal;
        }

body{margin:0px;
    }

.caja{width: auto;
     /*max-width:;*/
     background-color: #ddd;
     font-family:Fira Sans, Sans;
     }

.cabecera{  height: 5rem;
            width: 100%;
            background-color: #bb482d;
            border-radius: 0px;
            color: #fff;
            text-align: center;
            }

header h4{margin-top:0px;
         }

.tabla{color:#ddd;
       border:none;
       background-color: #333;
       border-radius: 0px;
       }

.tabla th   {width:auto;
              border-style: solid;
              border-color: grey;
              border-width: 1px;

            }

.celda_izq{
}

.celda_cen{
  min-width: 250px;
  width:auto;
}

.celda_der{
}

.entrada{border-radius:5px;
        min-width: 250px;
         width:auto;
}

.salida{border-radius:5px;
         width:78px;
}

.boton{border-radius:   5px;
       font-family:Fira Sans, Sans;
}

footer{color:#bb482d;
        text-align:right;
        font-size:90%;
        }

#resultados{text-align: center;
}