html {
  background: url(https://files.catbox.moe/ht1iii.jpg) ;
}

.box {
  min-width: 1000px;
  margin: 70px auto;
  display: grid ;
  grid-gap: 15px;
  grid-template-columns: 250px minmax(0,1fr);
}
  

header { 
  grid-row: 1/2;
  grid-column: 1/3;
text-align: center;
color: #ffffff;
}

nav { 
  grid-row: 2/3;
  grid-column: 1/2;
  border: black 2px solid;
  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: 2/3;
height: max-content;
 
}
nav, main, footer { background-color: #22bd6f;}