styles.css

.multi-value-formatter-content span {
  padding: 2px 4px;
  border-radius: 2px;
  border: 1px solid lightgrey;
  margin-right: 4px;
}

/* --------- customized react-tags styles */
.react-tags {
  padding: 0px 0 0 6px !important;
  border: none !important;
}
.react-tags__selected-tag:after {
  /* TODO: for now, don't show the delete icon "X" for react-tags */
  display: none !important;
}
.react-tags__selected-tag {
  padding: 2px 4px !important;
}

/* --------- default react-tags styles */
.react-tags__search input {
  width: 100% !important;
}

.react-tags {
  position: relative;
  padding: 6px 0 0 6px;
  border: 1px solid #D1D1D1;
  border-radius: 1px;

  /* shared font styles */
  font-size: 1em;
  line-height: 1.2;

  /* clicking anywhere will focus the input */
  cursor: text;
}

.react-tags.is-focused {
  border-color: #B1B1B1;
}

.react-tags__selected {
  display: inline;
}

.react-tags__selected-tag {
  display: inline-block;
  box-sizing: border-box;
  margin: 0 6px 6px 0;
  padding: 6px 8px;
  border: 1px solid #D1D1D1;
  border-radius: 2px;
  background: #F1F1F1;

  /* match the font styles */
  font-size: inherit;
  line-height: inherit;
}

.react-tags__selected-tag:after {
  content: '\2715';
  color: #AAA;
  margin-left: 8px;
}

.react-tags__selected-tag:hover,
.react-tags__selected-tag:focus {
  border-color: #B1B1B1;
}

.react-tags__search {
  display: inline-block;

  /* match tag layout */
  padding: 7px 2px;
  margin-bottom: 6px;

  /* prevent autoresize overflowing the container */
  max-width: 100%;
}

@media screen and (min-width: 30em) {

  .react-tags__search {
    /* this will become the offsetParent for suggestions */
    position: relative;
  }

}

.react-tags__search input {
  /* prevent autoresize overflowing the container */
  max-width: 100%;

  /* remove styles and layout from this element */
  margin: 0;
  padding: 0;
  border: 0;
  outline: none;

  /* match the font styles */
  font-size: inherit;
  line-height: inherit;
}

.react-tags__search input::-ms-clear {
  display: none;
}

.react-tags__suggestions {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
}

@media screen and (min-width: 30em) {

  .react-tags__suggestions {
    width: 240px;
  }

}

.react-tags__suggestions ul {
  margin: 4px -1px;
  padding: 0;
  list-style: none;
  background: white;
  border: 1px solid #D1D1D1;
  border-radius: 2px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.react-tags__suggestions li {
  border-bottom: 1px solid #ddd;
  padding: 6px 8px;
}

.react-tags__suggestions li mark {
  text-decoration: underline;
  background: none;
  font-weight: 600;
}

.react-tags__suggestions li:hover {
  cursor: pointer;
  background: #eee;
}

.react-tags__suggestions li.is-active {
  background: #b7cfe0;
}

.react-tags__suggestions li.is-disabled {
  opacity: 0.5;
  cursor: auto;
}