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HTML

              
                <!-- Updated border colors such as for an error state -->
<!-- Add to .select ➡️ style="--select-border: red; --select-focus: red" -->

<label for="standard-select">Standard Select</label>
<div class="select">
  <select id="standard-select">
    <option value="Option 1">Option 1</option>
    <option value="Option 2">Option 2</option>
    <option value="Option 3">Option 3</option>
    <option value="Option 4">Option 4</option>
    <option value="Option 5">Option 5</option>
    <option value="Option length">Option that has too long of a value to fit</option>
  </select>
  <span class="focus"></span>
</div>

<label for="multi-select">Multiple Select</label>
<div class="select select--multiple">
  <select id="multi-select" multiple>
    <option value="Option 1">Option 1</option>
    <option value="Option 2">Option 2</option>
    <option value="Option 3">Option 3</option>
    <option value="Option 4">Option 4</option>
    <option value="Option 5">Option 5</option>
    <option value="Option length">Option that has too long of a value to fit</option>
  </select>
  <span class="focus"></span>
</div>

<label for="standard-select-disabled">Disabled Select</label>
<div class="select select--disabled">
  <select id="standard-select-disabled" disabled>
    <option value="Option 1">Option 1</option>
    <option value="Option 2">Option 2</option>
    <option value="Option 3">Option 3</option>
    <option value="Option 4">Option 4</option>
    <option value="Option 5">Option 5</option>
    <option value="Option length">Option that is a long value and could wrap</option>
  </select>
</div>

<label for="standard-select">Disabled Multiple Select</label>
<div class="select select--disabled select--multiple">
  <select id="multi-select-disabled" multiple disabled>
    <option value="Option 1">Option 1</option>
    <option value="Option 2">Option 2</option>
    <option value="Option 3">Option 3</option>
    <option value="Option 4">Option 4</option>
    <option value="Option 5">Option 5</option>
    <option value="Option length">Option that is a long value and could wrap</option>
  </select>
</div>
              
            
!

CSS

              
                // Learn about this solution to creating custom select styles:
// @link https://moderncss.dev/custom-select-styles-with-pure-css/

*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --select-border: #777;
  --select-focus: blue;
  --select-arrow: var(--select-border);
}

select {
  // A reset of styles, including removing the default dropdown arrow
  appearance: none;
  background-color: transparent;
  border: none;
  padding: 0 1em 0 0;
  margin: 0;
  width: 100%;
  font-family: inherit;
  font-size: inherit;
  cursor: inherit;
  line-height: inherit;

  // Stack above custom arrow
  z-index: 1;

  // Remove dropdown arrow in IE10 & IE11
  // @link https://www.filamentgroup.com/lab/select-css.html
  &::-ms-expand {
    display: none;
  }

  // Remove focus outline, will add on alternate element
  outline: none;
}

.select {
  display: grid;
  grid-template-areas: "select";
  align-items: center;
  position: relative;

  select,
  &::after {
    grid-area: select;
  }

  min-width: 15ch;
  max-width: 30ch;

  border: 1px solid var(--select-border);
  border-radius: 0.25em;
  padding: 0.25em 0.5em;

  font-size: 1.25rem;
  cursor: pointer;
  line-height: 1.1;

  // Optional styles
  // remove for transparency
  background-color: #fff;
  background-image: linear-gradient(to top, #f9f9f9, #fff 33%);

  // Custom arrow
  &:not(.select--multiple)::after {
    content: "";
    justify-self: end;
    width: 0.8em;
    height: 0.5em;
    background-color: var(--select-arrow);
    clip-path: polygon(100% 0%, 0 0%, 50% 100%);
  }
}

// Interim solution until :focus-within has better support
select:focus + .focus {
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  bottom: -1px;
  border: 2px solid var(--select-focus);
  border-radius: inherit;
}

select[multiple] {
  padding-right: 0;

  /*
   * Safari will not reveal an option
   * unless the select height has room to 
   * show all of it
   * Firefox and Chrome allow showing 
   * a partial option
   */
  height: 6rem;

  option {
    white-space: normal;

    // Only affects Chrome
    outline-color: var(--select-focus);
  }

  /* 
   * Experimental - styling of selected options
   * in the multiselect
   * Not supported crossbrowser
   */
  //   &:not(:disabled) option {
  //     border-radius: 12px;
  //     transition: 120ms all ease-in;

  //     &:checked {
  //       background: linear-gradient(hsl(242, 61%, 76%), hsl(242, 61%, 71%));
  //       padding-left: 0.5em;
  //       color: black !important;
  //     }
  //   }
}

.select--disabled {
  cursor: not-allowed;
  background-color: #eee;
  background-image: linear-gradient(to top, #ddd, #eee 33%);
}

label {
  font-size: 1.125rem;
  font-weight: 500;
}

.select + label {
  margin-top: 2rem;
}

body {
  min-height: 100vh;
  display: grid;
  place-content: center;
  grid-gap: 0.5rem;
  font-family: "Baloo 2", sans-serif;
  background-color: #e9f2fd;
  padding: 1rem;
}

              
            
!

JS

              
                
              
            
!
999px

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