<button>
  <svg viewBox="0 0 220 80">
    <rect width="100%" height="100%" fill="none" />
  </svg>
  <span>Оставить заявку</span>
</button>
<br>
Наведи курсор на кнопку

button {
  display: block;
  background: none;
  border: none;
  position: relative;
  outline: none;
  width: 220px;
  height: 80px;
  cursor: pointer;
}

button svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  stroke-dasharray: 70 75;
  stroke-dashoffset: 20;
  stroke: #000;
  stroke-width: 2;
}

button span {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
}

button:hover svg {
  animation: stroke 1s linear alternate infinite;
}

@keyframes stroke {
  0% {
    stroke-dashoffset: -300px;
    stroke: green;
  }

  100% {
    stroke-dashoffset: 300px;
    stroke: orange;
  }
}