How to change color / props not assigned correctly about vue-loading-spinner HOT 8 CLOSED

<rotate-square2 background="#abcdef" shadow="#cc0000"></rotate-square2>

<template>
    <div v-bind:style="styles" class="spinner spinner--rotate-square-2">
        <div class="shadow" v-bind:style="shadowStyles"></div>
        <div class="square" v-bind:style="squareStyles"></div>
    </div>
</template>

<script>
export default {
  props: {
    size: {
      default: '40px'
    },
    background: {
      default: '#41b883'
    },
    shadow: {
        default: '#000'
    }
  },
  computed: {
    styles () {
      return {
        width: this.size,
        height: this.size,
      }
    },
    squareStyles() {
        return {
            background: this.background
        }
    },
    shadowStyles() {
        return {
            background: this.shadow
        }
    }
  }
}
</script>

<style lang="scss" scoped>
  .spinner {
    position: relative;
    * {
        line-height: 0;
        box-sizing: border-box;
    }
    /*&:before {*/
    .shadow {
      content: '';
      width: 100%;
      height: 20%;
      min-width: 5px;
      background: #000;
      opacity: 0.1;
      position: absolute;
      bottom: 0%;
      left: 0;
      border-radius: 50%;
      animation: rotate-square-2-shadow .5s linear infinite;
    }
    /*&:after {*/
    .square {
      content: '';
      width: 100%;
      height: 100%;
      background: #41b883;
      animation: rotate-square-2-animate .5s linear infinite;
      position: absolute;
      bottom:40%;
      left: 0;
      border-radius: 3px;
    }
  }

  @keyframes rotate-square-2-animate {
    17% {
      border-bottom-right-radius: 3px;
    }
    25% {
      transform: translateY(20%) rotate(22.5deg);
    }
    50% {
      transform: translateY(40%) scale(1, .9) rotate(45deg);
      border-bottom-right-radius: 50%;
    }
    75% {
      transform: translateY(20%) rotate(67.5deg);
    }
    100% {
      transform: translateY(0) rotate(90deg);
    }
  }


  @keyframes rotate-square-2-shadow {
    0%, 100% {
      transform: scale(1, 1);
    }
    50% {
      transform: scale(1.2, 1);
    }
  }
</style>