#menu {
  position: fixed;
  top: 0;
  left:0;
  left: -250px;
  width: 250px;
  height: 100%;
  background-color: #000;
  z-index: 999;
  opacity: 0;
  transition: all 0.5s ease;
  box-shadow: 0 0 20px #000;
  border-style: solid;
  border-width: 0 1px 0 0;
  border-color: #333;
  max-height:100vh;
  margin-block-start: 0 !important;
}

.menu-title {
  padding: 10px 20px 10px 20px;
  border-style: solid;
  border-width: 0 0 1px 0;
  border-color: #333;
}
.open-menu {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 2;
  width: 32px;
  height: 32px;
  cursor: pointer;
  fill: #fff;
}

.close-menu {
  position: absolute;
  top: 15px;
  right: 5px;
  cursor: pointer;
  fill: #fff;
  width: 24px;
  height: 24px;
  padding: 3px;
  box-shadow: 0 0 20px #000;
  background-color: #000;
}

#menu.open {
  opacity: 1;
  left: 0;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0 0 0 0;
}

li {
  margin: 10px 0;
}

a {
  text-decoration: none;
  color: #fff;
  padding: 20px;
}