.header {
  height: 55px;

  display: flex;
  flex-direction: row;
  justify-content: space-between;
}

.left-section {
  
  width: 150px;
}

.middle-section {
  background-color: lightpink;
  flex: 3;
  margin-left: 70px;
  margin-right: 35px;

}

.right-section {
  
  flex: 1;
}