html, body {
  background-color: #333333;
  box-sizing: border-box;
  height: 100%;
  line-height: 0;
  margin: 0;
  width: 100%;
  * {
    box-sizing: border-box;
    line-height: 1;
  }
}

body {
  scrollbar-width: thin;
  scrollbar-color: #777 #333;
}
::-webkit-scrollbar {
  width: 12px;
}
::-webkit-scrollbar-track {
  background: #333;
}
::-webkit-scrollbar-thumb {
  background-color: #777;
  border-radius: 20px;
  border: 3px solid #333;
}