JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="durationDropdown">
<select role="listbox" class="durationSelect">
<option value="0">Less than 1 month</option>
</select>
</div>
  
</div>

CSS

.container {
  width: 150px;
}

.durationDropdown {
  padding: 0px;
  flex: 1;
  text-align: left;
  position: relative;
  cursor: pointer;
  height: 5.1875rem;
  transition: 250ms;
  border: 1px solid #eee;
}

.durationDropdown::after {
  content: "";
  display: block;
  width: 40px;
  top: 0%;
  right: 0;
  height: 100%;
  position: absolute;
  background: linear-gradient(to right, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 1) 63%);
  pointer-events: none;
}

.durationDropdown:hover::after,
.durationDropdown:active::after {
  background: none;
}

.durationDropdown:hover {
  background: black;
}

.heading {
  text-transform: uppercase;
  padding: 15px 20px 20px 20px;
  font-size: 10px;
  letter-spacing: 2px;
  font-family: var(--font-avenir);
  font-weight: 600;
}

.durationSelect {
  transition: 250ms;
  background-color: transparent;
  border: 0;
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font-avenir);
  color: var(--color-greyLight);
  outline: none;
  position: absolute;
  top: 0;
  height: 100%;
  padding: 22px 0 0 20px;
  cursor: pointer;
  overflow:hidden;
}

.durationDropdown:hover .heading {
  color: var(--color-greyLightest);
}

.durationDropdown:hover .durationSelect {
  color: white !important;
}

.durationSelect:hover,
.durationSelect:active,
.durationSelect:focus {
  background-color: transparent;
  color: var(--color-greyLight);
}

@media screen and (max-width: 800px) {
  .durationSelect {
    font-size: 16px;
  }
  .durationDropdown:hover {
    background: none;
  }
  .durationDropdown::after {
    top: -8%;
  }
}