.uno{
color:darkmagenta;
background-color:red;
width:100%;
height:50px;
font-size:20px;
font-family:verdana;
font-weight:bold;
text-align:center;}
.dos{
  background-color:#dcfa46;
  height:400px;
  width:25%;
  float:left;}
  .tres{
    background-color:lightblue;
    height:400px;
    width:75%;
    float:left;}
  .cuatro{
    height:100px;
    width:50%;
    float:left;
    background-color:pink;
    text-align:center;}
.cinco{
      background-color:lightgreen;
      height:400px;
      width:50%;
      float:left;
      font-size:25px;
      font-weight:bold;
      font-style:italic;}
.gris{
       background-color:grey; 
       height:50px;
       width:500px;
       font-size:25px;
       font-style:italic;
       font-family:tahoma;
       font-weight:bold;}