@mixin block-glowing-effect($selector: focus, $fade-time: 300ms, $glowing-effect-color: fade-out($base-color, 0.25)) {
  transition: box-shadow $fade-time, border-color $fade-time ease-in-out;
  &:#{$selector} {
    box-shadow: 0 0 5px $glowing-effect-color;
    border-color: $glowing-effect-color;
  }
}