html,
body {
  width: 100%;
  height: 100%;
  background-color: #c0b3c9;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
}

body {
  overflow-y: scroll;
  -ms-overflow-style: none;    /* IE, Edge 対応 */
  scrollbar-width: none;       /* Firefox 対応 */
}
body::-webkit-scrollbar {  /* Chrome, Safari 対応 */
  display:none;
}