.container {
  display: grid;
  grid-template-areas:
    "header header header"
    "content1 content1 content2"
    "content3 content3 content4"
    "content3 content3 content5"
    "content6 content7 content5";
  grid-template-columns: 1fr 1fr 1fr;
  padding: 10px;
}

.container > div {
  background-color: rgb(255, 255, 255);
  border: 1px;
  border: 1px solid black;
  padding: 10p
}

.container > div.header {
  grid-area: header;
  text-align: center;
}

.container > div.content1 {
  grid-area: content;
}

.container > div.content2 {
  grid-area: content;
}


.container > div.content3 {
  grid-area: content;
}

.container > div.content4 {
  grid-area: content;
}


.container > div.content5 {
  grid-area: content;
}

.container > div.content6 {
  grid-area: content;
}

.container > div.content6 {
  grid-area: content;
}

.container > div.footer {
  grid-area: footer;
}