This script works fine on desktop but won’t work on mobile and gives me no errors in the console.

Here is my html:

<p><select id="feet">

        <option value="0">0</option>

        <option value="4">4</option>

        <option value="5">5</option>

        <option value="6">6</option> 

    </select> feet <select id="inches">

        <option value="0">0</option>

        <option value="1">1</option>

        <option value="2">2</option>

        <option value="3">3</option>

        <option value="3">4</option>

        <option value="3">5</option>

        <option value="3">6</option>

        <option value="3">7</option>

        <option value="3">8</option>

        <option value="3">9</option>

        <option value="3">10</option>

        <option value="3">11</option> 

    </select> inches <select id="weight">

        <option value="0">0</option>

        <option value="100">100</option>

        <option value="105">105</option>

        <option value="110">110</option>

        <option value="115">115</option>

        <option value="120">120</option>

        <option value="125">125</option>

        <option value="130">130</option>

        <option value="135">135</option>

        <option value="140">140</option>

        <option value="145">145</option>

        <option value="150">150</option>

        <option value="155">155</option>

        <option value="160">160</option>

        <option value="165">165</option>

        <option value="170">170</option>

        <option value="175">175</option>

        <option value="180">180</option>

        <option value="185">185</option>

        <option value="190">190</option>

        <option value="195">195</option>

        <option value="200">200</option>

        <option value="205">205</option>

        <option value="210">210</option>

        <option value="215">215</option>

        <option value="220">220</option>

        <option value="225">225</option>

        <option value="230">230</option>

        <option value="235">235</option>

        <option value="240">240</option>

        <option value="245">245</option>

        <option value="250">250</option>

    </select> lbs. <input id="submit-btn" type="submit" value="Enter"></p>

<h3>BMI: <span id="output">0</span></h3>

And here is the javascript:

function computeBMI() {

  //Obtain user inputs

  var feet = Number(document.getElementById("feet").value);

  var inches = Number(document.getElementById("inches").value);

  var weight = Number(document.getElementById("weight").value);



  var height = Number(inches + (feet * 12));



  //Perform calculation

  var BMI = weight / Math.pow(height,2);

  var BMI = BMI * 703;



  //Display result of calculation

  document.getElementById("output").innerText = Math.round(BMI * 100)/100;

}

  

document.getElementById("submit-btn").addEventListener("click", computeBMI);