/* <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;
  border: 1px solid #fff;
  background-color: transparent;
  position: relative;
}

.menu__button::before {
  content: '';
  width: 100%;
  height: 0;
  background-color: #fff;
  position: absolute;
  bottom: 0;
  left: 0;
  z-index: -1;
  transition: all .4s;
}

.menu__button:hover::before {
  height: 100%;
  top: 0;
}

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

.menu__button:hover span {
  color: #000;
}