#panelContainer {
  display: flex;
  flex-direction: row;
  background-color: #ebebeb;
  color: #fff;
  flex: 1;
  overflow: hidden;
}
.panel {
  position: relative;
  width: 50%;
}

.slider {
  z-index: 999999;
  display: block;
  position: absolute;
  width: 5px;
  background-color: #1ABC9C;
  left: 0;
  top: 0;
  bottom: 0;
  overflow: visible;
  user-select: none;
}

.slider::before {
  content: "";
  position: absolute;
  left: 0.25rem;
  top: 50%;
  height: 1.5rem;
  width: 0.5rem;
  background-color: #1ABC9C;
  cursor: col-resize;
}


img {
  max-width: 100%;
  height: auto;
}