header{
  //background-color:violet;
  //float: center;
  text-align: center;
  border: 2px solid black;
}
nav{
  background-color: rgb(199, 193, 193);
}
body{
  background-image: linear-gradient(yellow,violet);
}
main {
  background-image: linear-gradient(violet,yellow);
  border: 2px solid black;
  width: 35%;
  height: 75%;
  float: left;
}
aside{
  background-image: linear-gradient(violet,yellow);
  border: 2px solid black;
  width: 35%;
  height: 75%;
  float: right;
}
footer{
  height: 5%;
  clear:both;
}