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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <h1>Dropdown with searchable text</h1>
<form>
	<label for="myHouse">Choose your country:</label>
	<input list="countryList" id="myCountry" name="myCountry" placeholder="type here..." />
	<datalist id="countryList">
   <option value="Afghanistan">
			<option value="Albania">
			<option value="Algeria">
			<option value="Andorra">
			<option value="Angola">
			<option value="Antigua and Barbuda">
			<option value="Argentina">
			<option value="Armenia">
			<option value="Australia">
			<option value="Austria">
			<option value="Azerbaijan">
			<option value="Bahamas">
			<option value="Bahrain">
			<option value="Bangladesh">
			<option value="Barbados">
			<option value="Belarus">
			<option value="Belgium">
			<option value="Belize">
			<option value="Benin">
			<option value="Bhutan">
			<option value="Bolivia">
			<option value="Bosnia and Herzegovina">
			<option value="Botswana">
			<option value="Brazil">
			<option value="Brunei">
			<option value="Bulgaria">
			<option value="Burkina Faso">
			<option value="Burundi">
			<option value="Côte d'Ivoire">
			<option value="Cabo Verde">
			<option value="Cambodia">
			<option value="Cameroon">
			<option value="Canada">
			<option value="Central African Republic">
			<option value="Chad">
			<option value="Chile">
			<option value="China">
			<option value="Colombia">
			<option value="Comoros">
			<option value="Congo (Congo-Brazzaville)">
			<option value="Costa Rica">
			<option value="Croatia">
			<option value="Cuba">
			<option value="Cyprus">
			<option value="Czechia (Czech Republic)">
			<option value="Democratic Republic of the Congo">
			<option value="Denmark">
			<option value="Djibouti">
			<option value="Dominica">
			<option value="Dominican Republic">
			<option value="Ecuador">
			<option value="Egypt">
			<option value="El Salvador">
			<option value="Equatorial Guinea">
			<option value="Eritrea">
			<option value="Estonia">
			<option value="Eswatini (fmr. "Swaziland")">
			<option value="Ethiopia">
			<option value="Fiji">
			<option value="Finland">
			<option value="France">
			<option value="Gabon">
			<option value="Gambia">
			<option value="Georgia">
			<option value="Germany">
			<option value="Ghana">
			<option value="Greece">
			<option value="Grenada">
			<option value="Guatemala">
			<option value="Guinea">
			<option value="Guinea-Bissau">
			<option value="Guyana">
			<option value="Haiti">
			<option value="Holy See">
			<option value="Honduras">
			<option value="Hungary">
			<option value="Iceland">
			<option value="India">
			<option value="Indonesia">
			<option value="Iran">
			<option value="Iraq">
			<option value="Ireland">
			<option value="Israel">
			<option value="Italy">
			<option value="Jamaica">
			<option value="Japan">
			<option value="Jordan">
			<option value="Kazakhstan">
			<option value="Kenya">
			<option value="Kiribati">
			<option value="Kuwait">
			<option value="Kyrgyzstan">
			<option value="Laos">
			<option value="Latvia">
			<option value="Lebanon">
			<option value="Lesotho">
			<option value="Liberia">
			<option value="Libya">
			<option value="Liechtenstein">
			<option value="Lithuania">
			<option value="Luxembourg">
			<option value="Madagascar">
			<option value="Malawi">
			<option value="Malaysia">
			<option value="Maldives">
			<option value="Mali">
			<option value="Malta">
			<option value="Marshall Islands">
			<option value="Mauritania">
			<option value="Mauritius">
			<option value="Mexico">
			<option value="Micronesia">
			<option value="Moldova">
			<option value="Monaco">
			<option value="Mongolia">
			<option value="Montenegro">
			<option value="Morocco">
			<option value="Mozambique">
			<option value="Myanmar (formerly Burma)">
			<option value="Namibia">
			<option value="Nauru">
			<option value="Nepal">
			<option value="Netherlands">
			<option value="New Zealand">
			<option value="Nicaragua">
			<option value="Niger">
			<option value="Nigeria">
			<option value="North Korea">
			<option value="North Macedonia">
			<option value="Norway">
			<option value="Oman">
			<option value="Pakistan">
			<option value="Palau">
			<option value="Palestine State">
			<option value="Panama">
			<option value="Papua New Guinea">
			<option value="Paraguay">
			<option value="Peru">
			<option value="Philippines">
			<option value="Poland">
			<option value="Portugal">
			<option value="Qatar">
			<option value="Romania">
			<option value="Russia">
			<option value="Rwanda">
			<option value="Saint Kitts and Nevis">
			<option value="Saint Lucia">
			<option value="Saint Vincent and the Grenadines">
			<option value="Samoa">
			<option value="San Marino">
			<option value="Sao Tome and Principe">
			<option value="Saudi Arabia">
			<option value="Senegal">
			<option value="Serbia">
			<option value="Seychelles">
			<option value="Sierra Leone">
			<option value="Singapore">
			<option value="Slovakia">
			<option value="Slovenia">
			<option value="Solomon Islands">
			<option value="Somalia">
			<option value="South Africa">
			<option value="South Korea">
			<option value="South Sudan">
			<option value="Spain">
			<option value="Sri Lanka">
			<option value="Sudan">
			<option value="Suriname">
			<option value="Sweden">
			<option value="Switzerland">
			<option value="Syria">
			<option value="Tajikistan">
			<option value="Tanzania">
			<option value="Thailand">
			<option value="Timor-Leste">
			<option value="Togo">
			<option value="Tonga">
			<option value="Trinidad and Tobago">
			<option value="Tunisia">
			<option value="Turkey">
			<option value="Turkmenistan">
			<option value="Tuvalu">
			<option value="Uganda">
			<option value="Ukraine">
			<option value="United Arab Emirates">
			<option value="United Kingdom">
			<option value="United States of America">
			<option value="Uruguay">
			<option value="Uzbekistan">
			<option value="Vanuatu">
			<option value="Venezuela">
			<option value="Vietnam">
			<option value="Yemen">
			<option value="Zambia">
			<option value="Zimbabwe"> 
 </datalist>
</form>
!

CSS 

              
                /* Only for styling, not required for it to work */
body {
	background-color: lightsteelblue;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
}
h1 {
	font-size: 3rem;
	color: #212121;
}

form {
	max-width: 40vw;
	display: flex;
	flex-direction: column;
}

form label {
	font-family: "Open Sans", sans-serif;
	font-size: 1.2rem;
	margin-bottom: 12px;
}

form input {
	border: 2px solid lightslategray;
	height: 40px;
	border-radius: 3px;
	padding: 5px;
	font-size: 1rem;
}

form input:focus {
	outline: none;
	border: 2px solid darkslategray;
}
!

JS
!
999px

Console