Button.vue

<template>
  <button @click="$emit('emit')">
    <slot />
    <span v-if="cta">{{ cta }}</span>
  </button>
</template>

<script>
export default {
  props: {
    cta: {
      type: String,
      default: null
    }
  }
}
</script>

<style lang="postcss" scoped>
button {
  --color: 255,255,255;
  --background-color: 0,118,255; /*0,118,255*/
  /* min-width: 64px; */
  height: 32px;
  color: rgb(var(--background-color));
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 0 16px;
  font-size: 13px;
  font-family: inherit;
  font-weight: 600;
  letter-spacing: .0892857143em;
  text-transform: uppercase;
  user-select: none;
  -webkit-appearance: none;
  position: relative;
  margin: 8px 0;
  will-change: transform, opacity;
  outline: none;
  line-height: 24px;
}
svg {
  margin-top: -2px;
  /* margin-right: 8px; */
  vertical-align: middle;
}
button::before {
  content: '';
  background-color: rgb(var(--background-color));
  opacity: 0;
  pointer-events: none;
}
button::before {
  position: absolute;
  top: 0;
  left: 0;
  width: calc(100% + 2px);
  height: calc(100% + 2px);
  transform: scale(1);
  transition: opacity 15ms linear, background-color 15ms linear;
  border-radius: 4px;
  z-index: 1;
}
[outlined] {
  background-color: transparent;
  border-color: rgb(var(--background-color));
  margin: 8px 16px;
}

button:hover { cursor: pointer; }
button:hover::before { opacity: .05; }
button:active::before { opacity: 0.12; }
/* button:not(:disabled) { background-color: red; } */

[raised],
[unelevated] {
  color: rgb(var(--color));
  background-color: rgb(var(--background-color));
  margin: 8px 16px;
}
[raised] {
  box-shadow: rgba(var(--background-color), 0.24) 0px 5px 10px 0px;
  transition: box-shadow 150ms ease-in;
}
[raised]:active {
  transform: scale(0.98);
  box-shadow: none;
}
[unelevated] { box-shadow: none; }
button:disabled { color: #7f7f7f; }
</style>

    <AppButton cta="Button" />
    <AppButton raised cta="raised" />
    <AppButton outlined>
      <Icon />
    </AppButton>
    <AppButton>
      <Icon />
    </AppButton>
    <AppButton cta="unelevated" unelevated />
    <AppButton cta="outlined" outlined />
    <AppButton cta="disabled" disabled />
    <AppButton cta="outlined" outlined>
      <Icon />
    </AppButton>
    <AppButton cta="emit" @emit="foo" />