@mixin dropdown {
  box-shadow: $elevation;
  background-color: $white;
  border-radius: 4px;
  border: 1px solid $borderColor;
  display: block;
  box-sizing: border-box;
  position: absolute;
  //1 - border
  top: calc(100% + 8px + 1px);
  left: 0;
  z-index: 1000;
  padding: 3px 0;
  margin: 0;
  width: 100%;
  overflow-y: auto;
  text-align: left;
  list-style: none;
}