<template>
<button>Pulse</button>
</template>

<style scoped>
button {
  z-index: 1;
  position: relative;
  font-size: inherit;
  font-family: inherit;
  color: white;
  padding: 0.5em 1em;
  outline: none;
  border: none;
  background-color: hsl(236, 32%, 26%);
}

button:hover {
  cursor: pointer;
}

button::before {
  content: '';
  z-index: -1;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  border: 4px solid hsl(236, 32%, 26%);
  transform-origin: center;
  transform: scale(1);
}

button:hover::before {
  transition: all 0.75s ease-in-out;
  transform-origin: center;
  transform: scale(1.75);
  opacity: 0;
}
</style>