.wrapper{
  text-align: center;
  background-image: 
  linear-gradient(transparent calc(49%), skyblue calc(49%), transparent calc(49% + 1px)),
  linear-gradient(transparent calc(49%), skyblue calc(49%), transparent calc(49% + 1px));
  background-size: calc(45% - 80px);
  background-repeat: no-repeat;
  background-position: 0 0, 100% 0;
}