.Button {
  border-radius: 0.25em;
  box-shadow: inset 0 0 0 0.1em #fff, inset 0 0 0 0.25em @color-Link--bg;
  display: block;
  padding: 0.75em 1em;
  text-align: center;

  @media @xs {
    display: inline-block;
  }

  &--clear {
    box-shadow: inset 0 0 0 0.1em #fff;
  }
}

.Button {
  border-radius: 0.25em;
  box-shadow: inset 0 0 0 unit(1/16, em) #fff, inset 0 0 0 unit(4/16, em) @color-Link--bg;
  display: block;
  padding: 0.75em 1em;
  text-align: center;

  @media @xs {
    display: inline-block;
  }

  &--clear {
    box-shadow: inset 0 0 0 unit(1/16, em) #fff;
  }
}

Change unit values to fractions
Change unit values to fractions
