#prolira {
      width: 800px;
      margin-right: auto;
      margin-left: 20px;
          font-family: courier new;
}



header{
        padding: 15px;

        text-align: center;

}
nav{
        text-align: left;
}

nav ul{list-style-type: none;
}

nav li{display: inline; margin-right: 20px;
}

section{
      width: 400px;
          height: 200px;
      float: left;
          padding: 15px;
          margin-top: 15px;
          margin-bottom: 15px;
          margin-right: 15px;
      border: 5px solid black;
      border-radius: 25px;
}


aside{
      width: 335px;
          height: 800px;
          float: right;
          padding: 15px;

          margin-top: 15px;
}