#main-header {
  background-attachment: fixed !important;
}

#mainNav {
  background-color: white !important;
  margin-top: 25px;
}

.top-wrap {
  background-color: #00d1ff !important;
}

@media (max-width: 800px) {
  #top-bar {
    display: none !important;
  }
}

@media (max-width: 480px) {
  #top-bar {
    display: none !important;
  }
}

#mainNav {
  background-color: white !important;
  margin-top: 0;
  padding-top: calc(var(--top-bar-height, 25px));
  z-index: 9998;
}

#top-bar {
  left: 0;
  width: 100%;
  min-height: 25px;
  z-index: 9999;
  background-color: #your-color;
  display: flex;
  align-items: center;
  padding: 0 10px;
  box-sizing: border-box;
  --top-bar-height: 25px;
  height: auto;
}