.box {
  border: 2px solid black;
  padding: 5px;
  margin: 5px;
  height: 500px;
  background: rgba(205, 254, 194, 0.7);
}

.grid-container {
  display: grid;
  grid-template-areas: "col1 col2 col3";
  background-image: url("https://files.catbox.moe/9qulcf.gif")
}

#g1 {
  grid-area: col1;
  max-height: 1000px;
  overflow-y: auto;
  overflow-x: auto;
}

#g2 {
  grid-area: col2;
  max-height: 1000px;
  overflow-y: auto;
  overflow-x: auto;
}

#g3 {
  grid-area: col3;
  max-height: 1000px;
  overflow-y: auto;
  overflow-x: auto;
}

#g4 {
  grid-area: col3;
  max-height: 300px;
  overflow-y: auto;
  overflow-x: auto;
}

#g5 {
  grid-area: col3;
  max-height: 300px;
  overflow-y: auto;
  overflow-x: auto;
}

#g6 {
  grid-area: col3;
  max-height: 1000px;
  overflow-y: auto;
  overflow-x: auto;
}

#g7 {
  grid-area: col3;
  max-height: 1000px;
  overflow-y: auto;
  overflow-x: auto;
}