@mixin btn ($border-color, $color, $bg-color, $hover-color, $bg-hover-color, $border-radius)
  border: 1px solid $border-color
  border-radius: $border-radius
  color: $color
  background-color: $bg-color
  cursor: pointer
  font-size: 22px
  outline: none
  white-space: nowrap
  transition: 0.5s
  &:hover, &:active, &:focus
    color: $hover-color
    background-color: $bg-hover-color

.btn
  @include btn ($l, $d, $l, $l, transparent, 0)  // your vars or css options