.caja
   {
      height: 50px;
      width: 250px;
      border: 5px solid #ff0000;
      margin: auto;
      text-align: center;
      border-radius: 30px;
      background-color: yellow;
      font-size: 25px;
      font-weight: bold;
      
}
canvas {

margin-left: auto;

margin-right: auto;

display: block;

}

  h1 {
    font-size: 50px;
    text-align: center;
    background-color: hotpink;
    border: blue, 5px, solid;
   }
   body {
    background-color: #b4c7db;
   }

h2{
   font-size: 30px;
   background-color: darkblue;
   color: pink;
   border: hotpink,5px,solid;
}