.border-position {
  position: fixed;
  z-index: 200;
  min-height: 20px;
  min-width: 20px;
}

.left {
  left: 0;
  top: 0;
  height: 100%;
}

.right {
  right: 0;
  top: 0;
  height: 100%;
}

.top {
  left: 0;
  top: 0;
  width: 100%;
}

.bottom {
  left: 0;
  bottom: 0;
  width: 100%;
}