.container {
  display: grid;
  grid-template-columns: auto auto auto;
  grid-template-rows: auto auto auto auto auto;
  box-sizing: border-box;
  margin: 0 auto;
  gap: 10px;
  padding: 20px;
}

.container > * {
  border: 1px solid rgb(0, 0, 0);
}


.a {
  display: flex;
  justify-content: space-evenly;
  align-items: center;
  grid-row: 1 / span 1;
  grid-column: 1 / span 3;
  width: 100%;
}

.a1 {
  font-size: xx-large;
}

.a2 {
  font-size: xx-large;
}

.a3 {
  font-size: xx-large;
}

.b {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  grid-row: 2 / span 3;
  grid-column: 1 / span 3;
  width: 100%;
}