.box {
   max-width: 5000px;
   margin: 50px auto;
   display: grid;
   grid-gap: 10px;
   grid-template-columns: 250px;
}

heading, other {
  border: 2px dotted black;
}

heading {
  grid-row: 1 / 2;
  grid-column: 1 / 3;
  border: dotted black 2px;
  background: #292929;
}

other {
  grid-row: 2 / 3;
  grid-column: 1 / 2;
  border: dotted black 2px;
  background: #292929;
  height: max-content;
}


.Miku {
  position: absolute;
  top: 50px;
  left: 300px;
}

.mikubanner {
  position: absolute;
  top: 220px;
  left: 30px;
}