body{
   margin: 5px;
   font-family: Calibri;
   background: #95391C;
   display: grid;
   grid-template-columns: repeat(4, 1fr);
   grid-template-areas:    "head  head head head"
                           "nav   main main main"
                           "aside main main main"
                           "foot  foot foot foot";
}
h1 {
   text-align: center;
   font-size: 50px;
}


header, nav, main, article, aside, footer {
   border: 5px solid;
   padding: 10px;
   margin: 2px;
}

header {
   background-color: #D3D3D3;
   border-color: #B0B0B0;
   grid-area: head;
}

nav {
   background-color: #FFFBF0;
   border-color: #E7C157;
   grid-area: nav;
}

main {
   background-color: #FFFFFF;
   border-color: #DF6C20;
   grid-area: main;
}

aside {
   background-color: #FFFBF0;
   border-color: #8DB243;
   grid-area: aside;
}

footer {
   background-color: #D3D3D3;
   border-color: #B0B0B0;
   grid-area: foot;
}
body
{ display: grid;
grid-template-columns: 1fr;
grid-template-areas: "head"
"main"
"aside"
"foot":
}

@media (min-widht: 30em) {
body{
grid-template-columns: "head head"
"nav aside"
"main main"
"foot foot";}
}
@media (win-width: 50em) {
body{
grid-template-columns: repeat (4, 1fr);
grid-template-areas: "head head head head"
"nav main main aside"
"foot foot foot foot";}
}