.container {
	max-width: 600px;
	margin: 0 auto;
	padding: 20px;
	border: 1px solid #ccc;
	border-radius: 5px;
}
form {
	display: flex;
	flex-direction: column;
}
label {
	margin-top: 10px;
}
input, select {
	margin-bottom: 10px;
}
button[type="button"] {
  background-color: #4CAF50;
  border: none;
  color: white;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  border-radius: 5px;
}

button[type="reset"] {
  background-color: #f44336;
  color: white;
  border: none;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  border-radius: 4px;
}

button:hover {
	opacity: 0.8;
}

.formula {
    font-family: times new roman;
    font-size: 1.6em;
    padding-left: 6px;
    font-weight: 400;
}

.fraction {
    display: inline-block;
    position: relative;
    vertical-align: middle;
    letter-spacing: 0.001em;
    text-align: center;
}

.fraction > span {
    display: block;
    padding: 0.1em;
}

.fraction span.fdn {
    border-top: 2px solid black;
}


@media (max-width: 480px) {
	.container {
		padding: 10px;
	}
	input, select {
		font-size: 14px;
	}
	button {
		font-size: 14px;
	}
}