.layout {
  
    width: 1366px;
  height: 768px;

  display: grid;
  grid:
    "header header header" auto
    "leftSide body rightSide" 1fr
    / 1fr 2fr 1fr;
  gap: 8px;
}

.header { grid-area: header; }
.leftSide { grid-area: leftSide; }
.body { 
    grid-area: body;
  }
.rightSide { grid-area: rightSide; }

body {
    background-color: "#e7e2e1";
}