How to Apply a CSS Style on Html5 Datalist Options

input.onfocus = function() {
  browsers.style.display = 'block';
  input.style.borderRadius = "5px 5px 0 0";
};
for (let option of browsers.options) {
  option.onclick = function() {
    input.value = option.value;
    browsers.style.display = 'none';
    input.style.borderRadius = "5px";
  }
};

input.oninput = function() {
  currentFocus = -1;
  var text = input.value.toUpperCase();
  for (let option of browsers.options) {
    if (option.value.toUpperCase().indexOf(text) > -1) {
      option.style.display = "block";
    } else {
      option.style.display = "none";
    }
  };
}
var currentFocus = -1;
input.onkeydown = function(e) {
  if (e.keyCode == 40) {
    currentFocus++
    addActive(browsers.options);
  } else if (e.keyCode == 38) {
    currentFocus--
    addActive(browsers.options);
  } else if (e.keyCode == 13) {
    e.preventDefault();
    if (currentFocus > -1) {
      /*and simulate a click on the "active" item:*/
      if (browsers.options) browsers.options[currentFocus].click();
    }
  }
}

function addActive(x) {
  if (!x) return false;
  removeActive(x);
  if (currentFocus >= x.length) currentFocus = 0;
  if (currentFocus < 0) currentFocus = (x.length - 1);
  x[currentFocus].classList.add("active");
}

function removeActive(x) {
  for (var i = 0; i < x.length; i++) {
    x[i].classList.remove("active");
  }
}

input {
  font-size: 18px;
  padding: 5px;
  height: 35px;
  width: 350px;
  border: 1px solid #000;
  outline: none;
  border-radius: 5px;
  color: #000;
  /*   border-bottom: none; */
}

datalist {
  position: absolute;
  background-color: white;
  border: 1px solid #000;
  border-radius: 0 0 5px 5px;
  border-top: none;
  width: 350px;
  padding: 5px;
}

option {
  background-color: white;
  padding: 4px;
  color: #000;
  margin-bottom: 1px;
  font-size: 18px;
  cursor: pointer;
  background: #eeeeee
}

option:hover,
.active {
  background-color: red;
}

<input autocomplete="off" role="combobox" list="" id="input" name="browsers">
<!-- Its important that you keep list attribute empty to hide the default dropdown icon and the browser's default datalist -->

<datalist id="browsers" role="listbox">
  <option value="Chrome">Chrome</option>
  <option value="Safari">Safari</option>
  <option value="Microsoft Edge">Microsoft Edge</option>
</datalist>

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