select 2とBootstrapの競合解決

bootstrapでcss , select2.cssの後に次のcssを加えます

/***
Select2 Plugin
***/
.form-control .select2-choice {
  border: 1px solid #e5e5e5;
  background-color: #fff;
  background-image: none;
  filter: none;
  height: 34px;
  padding: 3px 0 0px 12px;
}


.select2-container.select2-drop-above .select2-choice {
  border-bottom-color: #e5e5e5;
  background-color: #fff;
  background-image: none;
  filter: none;
}


.select2-drop {
  border: 1px solid #e5e5e5;
  background-color: #fff;
  background-image: none;
  -webkit-box-shadow: none;
  box-shadow: none;
  filter: none;
  border-top: 0;
}
.select2-drop-auto-width {
  border-top: 1px solid #e5e5e5;
}


.select2-drop.select2-drop-above {
  border-top: 1px solid #e5e5e5;
  -webkit-box-shadow: none;
  box-shadow: none;
}


.select2-drop-active {
  border: 1px solid #999;
  border-top: 0;
}


.select2-container .select2-choice .select2-arrow {
  background-image: none;
  background-color: #fff;
  filter: none;
  border-left: 1px solid #e5e5e5;
}


.select2-container.select2-container-active .select2-arrow,
.select2-container.select2-dropdown-open .select2-arrow {
  border-left: 0 !important;
}


.select2-container .select2-choice .select2-arrow b {
  background-position: 0 1px;
}


.select2-search input {
  border: 1px solid #e5e5e5;
  background-color: #fff !important;
  filter: none;
  margin: 0;
  outline: 0;
  border: 1px solid #e5e5e5;
  webkit-appearance: none !important;
  color: #333333;
  outline: 0;
  box-shadow: none;
  height: auto !important;
  min-height: 26px;
  padding: 6px 6px !important;
  line-height: 20px;
  font-size: 14px;
  font-weight: normal;
  vertical-align: top;
  background-color: #ffffff;
  -webkit-box-shadow: none;
  box-shadow: none;
  margin-top: 5px;
}


.form-control.select2-container {
  border: 0;
  height: auto !important;
  padding: 0px;
}


.select2-container-active .select2-choice,
.select2-container-active .select2-choices {
  border: 1px solid #999 !important;
  -webkit-box-shadow: none !important;
  box-shadow: none !important;
}


.select2-dropdown-open .select2-choice {
  border-bottom: 0 !important;
  background-image: none;
  background-color: #fff;
  filter: none;
  -webkit-box-shadow: none !important;
  box-shadow: none !important;
}


.select2-dropdown-open.select2-drop-above .select2-choice,
.select2-dropdown-open.select2-drop-above .select2-choices {
  border: 1px solid #999 !important;
  border-top: 0 !important;
  background-image: none;
  background-color: #fff;
  filter: none;
  -webkit-box-shadow: none !important;
  box-shadow: none !important;
}


.select2-drop.select2-drop-above.select2-drop-active {
  border: 1px solid #999 !important;
  border-bottom: 0 !important;
}


.select2-dropdown-open .select2-choice .select2-arrow b {
  background-position: -18px 1px;
}


.select2-results {
  margin: 5px 0;
}


.select2-results .select2-highlighted {
  background: #eee;
  color: #333;
}


.select2-results li em {
  background: #feffde;
  font-style: normal;
}


.select2-results .select2-highlighted em {
  background: transparent;
}


.select2-results .select2-highlighted ul {
  background: #fff;
  color: #000;
}


.select2-results .select2-no-results,
.select2-results .select2-searching,
.select2-results .select2-selection-limit {
  padding: 3px 7px 4px;
  background: #f4f4f4;
  display: list-item;
}


.select2-container-multi {
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  -ms-border-radius: 4px;
  -o-border-radius: 4px;
  border-radius: 4px;
}
.select2-container-multi .select2-choices {
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  -ms-border-radius: 4px;
  -o-border-radius: 4px;
  border-radius: 4px;
}
.select2-container-multi.select2-dropdown-open {
  -webkit-border-radius: 4px 4px 0 0;
  -moz-border-radius: 4px 4px 0 0;
  -ms-border-radius: 4px 4px 0 0;
  -o-border-radius: 4px 4px 0 0;
  border-radius: 4px 4px 0 0;
}
.select2-container-multi.select2-dropdown-open .select2-choices {
  -webkit-border-radius: 4px 4px 0 0;
  -moz-border-radius: 4px 4px 0 0;
  -ms-border-radius: 4px 4px 0 0;
  -o-border-radius: 4px 4px 0 0;
  border-radius: 4px 4px 0 0;
}
.select2-container-multi.select2-dropdown-open.select2-drop-above {
  -webkit-border-radius: 0 0 4px 4px;
  -moz-border-radius: 0 0 4px 4px;
  -ms-border-radius: 0 0 4px 4px;
  -o-border-radius: 0 0 4px 4px;
  border-radius: 0 0 4px 4px;
}
.select2-container-multi.select2-dropdown-open.select2-drop-above .select2-choices {
  -webkit-border-radius: 0 0 4px 4px;
  -moz-border-radius: 0 0 4px 4px;
  -ms-border-radius: 0 0 4px 4px;
  -o-border-radius: 0 0 4px 4px;
  border-radius: 0 0 4px 4px;
}


.select2-container-multi .select2-choices {
  padding-left: 6px;
  min-height: 34px;
  border: 1px solid #e5e5e5;
  background-image: none;
  background-color: #fff;
  filter: none;
  -webkit-box-shadow: none !important;
  box-shadow: none !important;
}


.select2-container-multi.select2-container-active .select2-choices {
  border: 1px solid #999 !important;
  background-image: none;
  background-color: #fff;
  filter: none;
  -webkit-box-shadow: none !important;
  box-shadow: none !important;
}


.select2-container-multi .select2-choices .select2-search-choice {
  padding: 3px 5px 3px 18px;
  margin: 5px 0 3px 5px;
  border: 1px solid #e5e5e5;
  background-image: none;
  background-color: #fff;
  filter: none;
  -webkit-box-shadow: none !important;
  box-shadow: none !important;
}