.input.check_boxes {
  margin-bottom: 2em;

  fieldset {
    border: 0;
    margin: 0;
    padding: 0;
  }

  legend {
    margin-bottom: 0.5em;

    label {
      color: $label-font-color;
      font-weight: 500;
    }

    abbr {
      border-bottom: 0;
      color: $input-required-color;
      margin-left: 2px;
      opacity: 0.8;
    }
  }

  .choice label {
    cursor: pointer;
  }

  input {
    margin-right: 0.5em;
  }
}

.input.check_boxes {
  margin-bottom: 2em;
  position: relative;

  fieldset {
    border: 0;
    margin: 0;
    padding: 0;
  }

  legend {
    margin-bottom: 0.5em;

    label {
      color: $label-font-color;
      font-weight: 500;
    }

    abbr {
      border-bottom: 0;
      color: $input-required-color;
      margin-left: 2px;
      opacity: 0.8;
    }
  }

  .choice label {
    cursor: pointer;
  }

  input {
    margin-right: 0.5em;
  }
}

Add position: relative to checkboxes input
Add position: relative to checkboxes input
