.box {
  border: 2px solid Black;
  padding: 5px;
  margin: 5px;
  height: 500px;
  background: lightpink
}
p {font-family: "ＭＳ Ｐゴシック";}
h1 {font-family: "ＭＳ Ｐゴシック";}

body { background: violet}

.grid-container {
  display: grid;
  grid-template-areas: "col1 col2 col2 col2 col2 col2";
}

#g1 {
  grid-area: col1;
}

#g2 {
  grid-area: col2;
}