/// Aplica estilos até o breakpoint informado.
/// @param {String} $breakpoint - Índice do Mapa de Breakpoints
@mixin media-breakpoint-down($breakpoint) {
  $size: map-get($breakpoints, get-previous-breakpoint($breakpoint)) - 1px;

  @media (max-width: $size) {
    @content;
  }
}