.box {
  max-width: 1000px;
  margin: 50px auto;
  display:grid; 
  grid-gap: 10px;
  grid-template-column: 250px minmax(0, 1fr);
  
} 


header {
  border:black 2px solid;
  grid-row: 1 / 2; 
  grid-column: 1 / 3; 
}
nav {
  border:black 2px solid;
  grid-row: 2 / 3;
  grid-column: 1 / 2;
  height: max-content;
  
}
main{
  border:black 2px solid;
  grid-row: 2 / 3;
  grid-column: 2 / 3;
  height: max-content;
}
footer{
  border:black 2px solid;
  grid-row: 3 / 4;
  grid-column: 1 / 3;
}