list.css

.list {
  color: #333;
  text-align: left;
  list-style-type: none;
  font-size: 24px;
  padding: 0;
  flex: 1;
  margin: 0;
}

.list-item {
  padding-left: 20px;
  cursor: pointer;
  position: relative;
}

.list-item.is-selected:after {
  background: url('checkmark.svg');
  background-size: 100%;
  content: ' ';
  display: block;
  height: 15px;
  left: -4px;
  position: absolute;
  top: 12px;
  width: 15px;
}

.list-item.is-selected {
  color: #5A56FD;
}