<select>
  <option selected value="0">Pure CSS Select</option>
  <option value="1">No Wrapper</option>
  <option value="2">No JS</option>
  <option value="3">Nice!</option>
</select>
$glass: rgba(255, 255, 255, 0.2);
$glass-icon: rgba(255, 255, 255, 0.3);
$gradient: linear-gradient(35deg, red, purple);
$option: #320a28;

body {
  background: $gradient;
}

/* <select> styles */
select {
  /* Reset */
  appearance: none;
  border: 0;
  outline: 0;
  font: inherit;
  /* Personalize */
  width: 20em;
  height: 3em;
  padding: 0 4em 0 1em;
  background: url(https://upload.wikimedia.org/wikipedia/commons/9/9d/Caret_down_font_awesome_whitevariation.svg)
      no-repeat right 0.8em center / 1.4em,
    linear-gradient(to left, $glass-icon 3em, $glass 3em);
  color: white;
  border-radius: 0.25em;
  box-shadow: 0 0 1em 0 rgba(0, 0, 0, 0.2);
  cursor: pointer;
  /* <option> colors */
  option {
    color: inherit;
    background-color: $option;
  }
  /* Remove focus outline */
  &:focus {
    outline: none;
  }
  /* Remove IE arrow */
  &::-ms-expand {
    display: none;
  }
}
View Compiled
/*
  Pure CSS Select 2.0
  - No wrapper version
  - SVG icon
  - Glass style
*/

External CSS

  1. https://raubaca.neocities.org/codepen/base.css

External JavaScript

This Pen doesn't use any external JavaScript resources.