html,
body,
.main {
  height: 100%;
  margin: 0;
  padding: 0;
}

.main {
  display: grid;
  place-items: center;
}

#container {
  border: 1px solid #999;
  border-radius: 5px;
  box-shadow: 0 0 5px #999;
  /* width: 700px; */
  /* height: 350px; */
}