/* <reset-style> ============================ */
button {
  border: none;
  background: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
  font-family: inherit;
}
/* <main-style> ============================ */
.menu__button {
  min-width: 62px;
  height: 36px;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 8px 16px;
  background-color: #fff;
  transition: background-color .4s;
}

.menu__button span {
  color: #000;
  line-height: 1;
  transition: color .4s;
}

.menu__button:hover {
  background: linear-gradient(90deg, #fff 50%, transparent 0) repeat-x,
		linear-gradient(90deg, #fff 50%, transparent 0) repeat-x,
		linear-gradient(0deg, #fff 50%, transparent 0) repeat-y,
		linear-gradient(0deg, #fff 50%, transparent 0) repeat-y;
  background-size: 6px 2px, 6px 2px, 2px 6px, 2px 6px;
  background-position: 0 0, 0 100%, 0 0, 100% 0;
  animation: linearGradientMove .4s infinite linear;
}

.menu__button:hover span {
  color: #fff;
}

@keyframes linearGradientMove {
  100% {
    background-position: 6px 0, -6px 100%, 0 -6px, 100% 6px;
  }
}