h1 { font-family: Arial;   
     font-size: large; 
     text-align:center  }
p  { color: gray; 
     font-family: Verdana; 
     font-size: medium; }
.error { color: red}
.centrar { vertical-align: middle; }
.Pie {font-family: Verdana;   
     font-size: smaller;
     color: Gray;
     }