* {
  margin: 0;
  padding: 0;
}
#body {
  background-color: #E8F5E9;
}
#wrap {
  width: 1200px;
  margin: 0 auto;
}
#header {
  height: 100px;
  background-color: #C8E6C9;
}
#nav {
  height: 100px;
  background-color: #A5D6A7;
}
#main {
  display: grid;
  grid-template-columns: 30% 40% 30%;
  grid-template-rows: 780px;
}
#aside {
  background-color: #81C784;
}
#section {
  background-color: #66BB6A;
}
#article {
  background-color: #4CAF50;
}
#footer {
  height: 100px;
  background-color: #43A047;
}
@media (max-width: 1300px){
  #wrap {
    width: 96%;
  }
}
@media (max-width: 768px){
  #wrap {
    width: 100%;
  }
  #main {
    grid-template-areas: 
      "aside section"
      "article article"
      ;
    grid-template-columns: 30% 70%;
    grid-template-rows: 680px 150px;
  }
  #aside {
    grid-area: aside;
  }
  #section {
    grid-area: section;
  }
  #article {
    grid-area: article;
  }
}
@media (max-width: 480px){
  #main {
    grid-template-areas: 
      "aside"
      "section"
      "article"
      ;
    grid-template-columns: 100%;
    grid-template-rows: 200px 430px 150px;
  }
}