.parent {
display: grid;
grid-template-columns: repeat(3, 1fr);
grid-template-rows: repeat(5, 1fr);
column-gap: 20px;
grid-row-gap: 20px;
}

.div1 { grid-area: 1 / 1 / 2 / 2; }
.div2 { grid-area: 1 / 2 / 2 / 3; }
.div3 { grid-area: 1 / 3 / 2 / 4; }
.div4 { grid-area: 2 / 1 / 4 / 2; }
.div5 { grid-area: 4 / 1 / 6 / 2; }
.div6 { grid-area: 2 / 2 / 3 / 4; }
.div7 { grid-area: 3 / 2 / 6 / 4; }

.center{
display: flex;
justify-content: center;
}

body {
  background-image:url("img/background.png");
  background-repeat: no-repeat;
  background-attachment: fixed;
}