JSFiddle - React, Tailwind, and code Playground

HTML

<script>
    function tempertureConverter(){
        var C = document.getElementById("degree").value;
        alert((9/5)*C+32);
    }
</script>

<form>
    Convert Celsius to Fahrenheit:<br>
    <input type="text" name="converterCtoF" id = "degree"><br>
    <input type="button" value="Submit" id = "submit" onClick = "tempertureConverter()">
</form>