.main-header{
  grid-column: 1/2;
  grid-row: 1/3;
  /* Here i want this to be fixed (scrolling should not have any effect)*/
  position: fixed;
  top: 0;
  height: 80px;
}
.main-content {
  padding-top: 100px;
  width: 100%;
  float: left;
}