style.css

* {
  -webkit-appearance: none;
}
.container {
  margin: 44px auto;
  padding: 22px;
  font-size: 14px;
  font-family: "Frutiger Next Com", "Arial", "Verdana", sans-serif;
}
.custom-select {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid #dfdedd;
}
.custom-select-wrapper {
  position: relative;
  user-select: none;
  width: 100%;
  margin-bottom: 24px;
}
.custom-select__trigger {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 8px;
  font-weight: 300;
  color: #707172;
  height: 40px;
  line-height: 40px;
  background: transparent;
  cursor: pointer;
}
.custom-select.open {
  border-color: #f08200;
}
.custom-select.open .custom-options {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
}
.custom-options {
  position: absolute;
  display: block;
  top: calc(100% + 1px);
  left: -1px;
  right: -1px;
  border: 1px solid #dfdedd;
  border-top: 0;
  background: white;
  transition: all 0.25s;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  z-index: 2;
}
.custom-option {
  position: relative;
  display: block;
  padding: 4px 8px;
  font-weight: 300;
  color: #707172;
  line-height: 40px;
  cursor: pointer;
  transition: all 0.25s;
}
.custom-option.selected {
  color: #f08200;
}
.custom-option:hover {
  cursor: pointer;
  background-color: #dfdedd;
}
.arrow {
  position: relative;
  height: 15px;
  width: 15px;
}
.arrow::before,
.arrow::after {
  content: "";
  position: absolute;
  bottom: 0px;
  width: 0.15rem;
  height: 100%;
  transition: all 0.25s;
}
.arrow::before {
  left: -5px;
  transform: rotate(-45deg);
  background-color: #394a6d;
}
.arrow::after {
  left: 5px;
  transform: rotate(45deg);
  background-color: #394a6d;
}
.open .arrow::before {
  left: -5px;
  transform: rotate(45deg);
}
.open .arrow::after {
  left: 5px;
  transform: rotate(-45deg);
}