.header {
display: grid;

grid-template-columns: 2fr 1fr 1fr;
grid-template-rows: 10em 10em;
grid-gap: 1em;
width: 100%;
}

.news {
display: grid;
grid-template-columns: repeat( 3, 1fr );
grid-template-rows: 10em;
grid-gap: 1em;
}
.header article:first-child {
grid-row-start: 1;
grid-row-end: 3;
}