div.multiselect {
  vertical-align: middle;
  font-weight: normal;
  text-align: left;
  display: inline-block;
  
  position: relative;
}

div.multiselect > button {
  background: #fff;
  text-align: left;
  display: inline-block;
  
  border: 1px solid #a9a9a9;
  border-radius: 2px;
  padding: 2px 20px 2px 4px;
  
  position: relative;
  width: 180px;
}

div.multiselect > button * {
  cursor: default;
}

div.multiselect > button > span {
  overflow: hidden;
  
  text-overflow: ellipsis;
  white-space: nowrap;
  display: block;
}

div.multiselect > button > span::after {
  border: 3px solid transparent;
  border-top: 6px solid #000;
  margin-top: -3px;
  
  position: absolute;
  right: 7px;
  top: 50%;
  
  content: '';
}

div.multiselect > div {
  background: #fff;
  text-align: left;
  color: #000;
  display: none;
  
  border: 1px solid #a9a9a9;
  padding: 4px;
  margin-bottom: 10px;
  overflow-x: hidden;
  overflow-y: auto;
  
  position: absolute;
  max-height: 300px;
  z-index: 10;
}

div.multiselect > div div {
  cursor: default;
  white-space: nowrap;
  
  padding: 1px 24px 1px 4px;
}

div.multiselect > div div.option:hover {
  background: #eee;
}

div.multiselect > div div.all {
  margin-bottom: 5px;
}

div.multiselect > div > div.group > div.group-label {
  font-weight: bold;
  
  margin-bottom: 5px;
}

div.multiselect > div > div.group:not(:first-child) > div.group-label {
  margin-top: 7px;
}