html, body {
  width: 100%;
  margin: 0;
  padding: 0;
}
h1 {
  text-align: center;
}
ul {
  padding: 0;
  margin: 0;
}
li {
  list-style: none;
}

::-webkit-scrollbar {
  width: 5px;
  height: 5px;
  border-radius: 5px;
  background-color: transparent;
}
::-webkit-scrollbar-thumb {
  width: 5px;
  height: 5px;
  border-radius: 5px;
  background-color: #e5bbbb;
}

.drag {
  cursor: grab;
}

.chosen {
  background-color: #c8ebfb;
}

.vertical-group {
  height: 500px;
  overflow: auto;
  width: 100px;
  margin: 0 auto;
  border: 1px solid #ccc;
  margin-bottom: 100px;
}

.vertical-group li {
  text-align: center;
  padding: 5px;
  margin: 5px;
  border: 1px solid #aaa;
}

.horizontal-group {
  width: 600px;
  margin: 0 auto;
  overflow: auto;
  white-space: nowrap;
  margin-bottom: 100px;
  border: 1px solid #ccc;
}

.horizontal-group li {
  text-align: center;
  width: 100px;
  height: 100px;
  padding: 5px;
  margin: 5px;
  border: 1px solid #aaa;
  display: inline-block;
}

.flex-group {
  width: 600px;
  height: 500px;
  overflow: hidden auto;
  margin: 0 auto;
  border: 1px solid #ccc;
  padding: 15px;
  margin-bottom: 100px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.flex-group li {
  text-align: center;
  width: 100px;
  height: 100px;
  padding: 5px;
  margin: 5px;
  border: 1px solid #aaa;
  display: inline-block;
}

.grid-group {
  width: 600px;
  height: 500px;
  overflow: auto;
  margin: 0 auto;
  margin-bottom: 100px;
  border: 1px solid #ccc;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.grid-group li {
  padding: 5px;
  margin: 5px;
  border: 1px solid #aaa;
}