.yellowPart {
  position: absolute;
  content: "";
  top: 0;
  left: -50px;
  width: 20%;
  height: 100%;
  min-width: 300px;
  background: linear-gradient(to left, #003e79, #bd8c01);
  transform: skew(45deg);
  z-index: 1;
}

.yellowPartOpuest {
  position: absolute;
  content: "";
  top: 0;
  right: -50px;
  width: 20%;
  height: 100%;
  min-width: 300px;
  background: linear-gradient(to right, #003d79, #bd8c01);
  transform: skew(-45deg);
  z-index: 1;
}

@media (max-width: 800px) {
  .yellowPart {
    width: 5%;
    left: -150px;
  }

  .yellowPartOpuest {
    width: 5%;
    right: -150px;
  }
}