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%visuallyhidden {
  margin: -1px;
  padding: 0;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip: rect(0, 0, 0, 0);
  position: absolute;
}

/* Usage

<button class="mobile-navigation-trigger">
  <b class="visually-hidden">Open the navigation</b>
  <img src="img/mobile-navigation-icon.svg">
</button>

.visually-hidden {
  @extend %visuallyhidden;
}

*/