cdsandoval/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <title>Propinas</title>
    <link rel="stylesheet" type="text/css" href="css/normalize.css" />
    <link rel="stylesheet" type="text/css" href="css/styles.css" />
  </head>

  <body>
    <div id="container">
      <h1>Propinas</h1>

      <div id="calculator">
        <form>
          <label>
            Cuanto costo la comida?<br />
            <input type="text" id="costoComida" /> soles
          </label>

          <label>
            Como calificaria la atencion ? <br />
            <select id="calidadServicio">
              <option disabled selected value="0">--Eliga una opcion--</option>
              <option value="0.3">30% - Increible</option>
              <option value="0.2">20% - Muy buena</option>
              <option value="0.15">15% - Buena</option>
              <option value="0.1">10% - Mala</option>
              <option value="0.05">5% - Muy mala</option>
            </select>
          </label>

          <label>
            Cuantas personas pagaron la comida?<br />
            <input type="text" id="totalPersonas" /> personas
          </label>

          <button type="button" id="calcular">Calcular!</button>
        </form>
      </div>

      <div id="propinaTotal">
        <sup>S/.</sup><span id="propina">0.00</span>
        <small id="cadaUno">Cada uno</small>
      </div>
    </div>

    <script type="text/javascript" src="script.js"></script>
  </body>
</html>

## script.js
function calcularPropina() {
  var costoComida = document.getElementById("costoComida").value;
  var calidadServicio = document.getElementById("calidadServicio").value;
  var totalPersonas = document.getElementById("totalPersonas").value;

  if (costoComida === "" || calidadServicio == 0) {
    window.alert("Por favor ingrese valores!");
    return;
  }

  if (totalPersonas === "" || totalPersonas <= 1) {
    totalPersonas = 1;

    document.getElementById("cadaUno").style.display = "none";
  } else {
    document.getElementById("cadaUno").style.display = "block";
  }

  var total = (costoComida * calidadServicio) / totalPersonas;
  total = Math.round(total * 100) / 100;
  total = total.toFixed(2);

  document.getElementById("propinaTotal").style.display = "block";
  document.getElementById("propina").innerHTML = total;
}

document.getElementById("propinaTotal").style.display = "none";
document.getElementById("cadaUno").style.display = "none";

document.getElementById("calcular").onclick = function() {
  calcularPropina();
};

## styles.css
body {
  background: #042037;
  background-size: cover;
  color: white;
}

#container {
  width: 400px;
  margin: 150px auto 0;
  padding: 50px;
  box-sizing: border-box;
  background: #805215;
  box-shadow: 0 10px 15px -8px #000;
  -webkit-border-radius: 5px;
  text-align: center;
}

h1 {
  margin: 0 0 20px;
  padding: 0 0 20px;
  border-bottom: solid 1px #ddd;
}

form {
  text-align: left;
}

form label {
  display: block;
  margin: 25p 0;
  font-weight: bold;
}

form input,
form select {
  padding: 8px;
  margin: 10px 0;
  color: black;
}

form input[type="text"] {
  width: 90px;
}

button {
  background: #042037;
  color: white;
  border: none;
  border-bottom: solid 4px #222;
  text-transform: uppercase;
  font-size: 18px;
  padding: 20px 30px;
  width: 100%;
}

button:hover {
  background: #123652;
  border-bottom-color: #111;
}

button:active {
  position: relative;
  top: 1px;
}

#propinaTotal {
  font-size: 50px;
  margin-top: 40px;
}

#propinaTotal:before {
  content: "Propina";
  font-size: 14px;
  font-weight: bold;
  display: block;
  text-transform: uppercase;
}

#propinaTotal sup {
  font-size: 24px;
  top: -18px;
}

#propinaTotal small {
  font-size: 14px;
  font-weight: bold;
  display: block;
}
	<!DOCTYPE html>
	<html>
	<head>
	<title>Propinas</title>
	<link rel="stylesheet" type="text/css" href="css/normalize.css" />
	<link rel="stylesheet" type="text/css" href="css/styles.css" />
	</head>

	<body>
	<div id="container">
	<h1>Propinas</h1>

	<div id="calculator">
	<form>
	<label>
	Cuanto costo la comida?<br />
	<input type="text" id="costoComida" /> soles
	</label>

	<label>
	Como calificaria la atencion ? <br />
	<select id="calidadServicio">
	<option disabled selected value="0">--Eliga una opcion--</option>
	<option value="0.3">30% - Increible</option>
	<option value="0.2">20% - Muy buena</option>
	<option value="0.15">15% - Buena</option>
	<option value="0.1">10% - Mala</option>
	<option value="0.05">5% - Muy mala</option>
	</select>
	</label>

	<label>
	Cuantas personas pagaron la comida?<br />
	<input type="text" id="totalPersonas" /> personas
	</label>

	<button type="button" id="calcular">Calcular!</button>
	</form>
	</div>

	<div id="propinaTotal">
	<sup>S/.</sup><span id="propina">0.00</span>
	<small id="cadaUno">Cada uno</small>
	</div>
	</div>

	<script type="text/javascript" src="script.js"></script>
	</body>
	</html>
	function calcularPropina() {
	var costoComida = document.getElementById("costoComida").value;
	var calidadServicio = document.getElementById("calidadServicio").value;
	var totalPersonas = document.getElementById("totalPersonas").value;

	if (costoComida === "" \|\| calidadServicio == 0) {
	window.alert("Por favor ingrese valores!");
	return;
	}

	if (totalPersonas === "" \|\| totalPersonas <= 1) {
	totalPersonas = 1;

	document.getElementById("cadaUno").style.display = "none";
	} else {
	document.getElementById("cadaUno").style.display = "block";
	}

	var total = (costoComida * calidadServicio) / totalPersonas;
	total = Math.round(total * 100) / 100;
	total = total.toFixed(2);

	document.getElementById("propinaTotal").style.display = "block";
	document.getElementById("propina").innerHTML = total;
	}

	document.getElementById("propinaTotal").style.display = "none";
	document.getElementById("cadaUno").style.display = "none";

	document.getElementById("calcular").onclick = function() {
	calcularPropina();
	};
	body {
	background: #042037;
	background-size: cover;
	color: white;
	}

	#container {
	width: 400px;
	margin: 150px auto 0;
	padding: 50px;
	box-sizing: border-box;
	background: #805215;
	box-shadow: 0 10px 15px -8px #000;
	-webkit-border-radius: 5px;
	text-align: center;
	}

	h1 {
	margin: 0 0 20px;
	padding: 0 0 20px;
	border-bottom: solid 1px #ddd;
	}

	form {
	text-align: left;
	}

	form label {
	display: block;
	margin: 25p 0;
	font-weight: bold;
	}

	form input,
	form select {
	padding: 8px;
	margin: 10px 0;
	color: black;
	}

	form input[type="text"] {
	width: 90px;
	}

	button {
	background: #042037;
	color: white;
	border: none;
	border-bottom: solid 4px #222;
	text-transform: uppercase;
	font-size: 18px;
	padding: 20px 30px;
	width: 100%;
	}

	button:hover {
	background: #123652;
	border-bottom-color: #111;
	}

	button:active {
	position: relative;
	top: 1px;
	}

	#propinaTotal {
	font-size: 50px;
	margin-top: 40px;
	}

	#propinaTotal:before {
	content: "Propina";
	font-size: 14px;
	font-weight: bold;
	display: block;
	text-transform: uppercase;
	}

	#propinaTotal sup {
	font-size: 24px;
	top: -18px;
	}

	#propinaTotal small {
	font-size: 14px;
	font-weight: bold;
	display: block;
	}