body {
  background-color: #CCFF33;
   color: #336600;
    font-family: Verdana, Geneva, w3-sans-serif;
margin: 20px
}
h2 {
color: #FF9900;
}
  .letras_minus {
  list-style-type: lower-alpha}
  .cuadrado {
  list-style-type: square}
  .registrado {
  list-style-type: #174}
  table{
    margin-left: 30%;
    width: 70%;
  border: 2px #cc0000 dotted; 
  
  border-collapse: collapse }
td , th {
  border: 2px #0000ff dotted;
  padding : 10px} 
  th {
    background-color:#66CC33}
.dcha{
  text-align: center }

.sin {
  list-style-type: none;
}