Change Select List Option background colour on hover

This can be done by implementing an inset box shadow. eg:

select.decorated option:hover {
    box-shadow: 0 0 10px 100px #1882A8 inset;
}

Here, .decorated is a class assigned to the select box.

Hope you got the point.

Select / Option elements are rendered by the OS, not HTML. You cannot change the style for these elements.

This way we can do this with minimal changes :)

<html>

<head>
  <style>
    option:hover {
      background-color: yellow;
    }
  </style>
</head>

<body>
  <select onfocus='this.size=10;' onblur='this.size=0;' onchange='this.size=1; this.blur();'>
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="opel">Opel</option>
    <option value="audi">Audi</option>
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="opel">Opel</option>
    <option value="audi">Audi</option>
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="opel">Opel</option>
    <option value="audi">Audi</option>
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="opel">Opel</option>
    <option value="audi">Audi</option>
  </select>

</body>

</html>

Implementing an inset box shadow CSS works on Firefox:

select option:checked,
select option:hover {
    box-shadow: 0 0 10px 100px #000 inset;
}

Checked option item works in Chrome:

select:focus > option:checked { 
    background: #000 !important;
}

There is test on https://codepen.io/egle/pen/zzOKLe

For me this is working on Google Chrome Version 76.0.3809.100 (Official Build) (64-bit)

Newest article I have found about this issue by Chris Coyier (Oct 28, 2019) https://css-tricks.com/the-current-state-of-styling-selects-in-2019/

Change Select List Option background colour on hover

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