Generated by SassMeister.com.

SassMeister-input-HTML.html

<div class="container">
  <div class="container__item">
    <div class="fpo--tomato"></div>
  </div>
  <div class="container__item">
    <div class="fpo--deeppink"></div>
  </div>
  <div class="container__item">
    <div class="fpo--seagreen"></div>
  </div>
</div>

SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

$fpo-size: 100% !default;
$fpo-bg: slategray !default;
$fpo-color--text: #fff !default;
$fpo-text: 'FPO' !default;

%fpo {
  position: relative;
  
  &:before {
    content: '';
    display: block;
  }
  
  &:after {
    font: 20px/1 Helvetica;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
}

@mixin fpo(
  $size: $fpo-size, 
  $bg: $fpo-bg, 
  $color--text: $fpo-color--text, 
  $text: $fpo-text
) {
  @extend %fpo;
  background: $bg;

  &:before {
    padding-bottom: if(unitless($size), percentage($size), $size);
  }
  
  &:after {
    content: $text;
    color: $color--text;
  }
}

.fpo--tomato {
  @include fpo(66%, tomato);
}

.fpo--deeppink {
  @include fpo(66%, deeppink);
}

.fpo--seagreen {
  @include fpo(66%, seagreen);
}

.container {
  display: flex;
  justify-content: space-around;
  width: 100%;
  
  &__item {
    width: 20%;
  }
}

SassMeister-output.css

.fpo--tomato, .fpo--deeppink, .fpo--seagreen {
  position: relative;
}

.fpo--tomato:before, .fpo--deeppink:before, .fpo--seagreen:before {
  content: '';
  display: block;
}

.fpo--tomato:after, .fpo--deeppink:after, .fpo--seagreen:after {
  font: 20px/1 Helvetica;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.fpo--tomato {
  background: tomato;
}

.fpo--tomato:before {
  padding-bottom: 66%;
}

.fpo--tomato:after {
  content: "FPO";
  color: #fff;
}

.fpo--deeppink {
  background: deeppink;
}

.fpo--deeppink:before {
  padding-bottom: 66%;
}

.fpo--deeppink:after {
  content: "FPO";
  color: #fff;
}

.fpo--seagreen {
  background: seagreen;
}

.fpo--seagreen:before {
  padding-bottom: 66%;
}

.fpo--seagreen:after {
  content: "FPO";
  color: #fff;
}

.container {
  display: flex;
  justify-content: space-around;
  width: 100%;
}

.container__item {
  width: 20%;
}

SassMeister-rendered.html

<div class="container">
  <div class="container__item">
    <div class="fpo--tomato"></div>
  </div>
  <div class="container__item">
    <div class="fpo--deeppink"></div>
  </div>
  <div class="container__item">
    <div class="fpo--seagreen"></div>
  </div>
</div>