body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

h1 {
  text-align: center;
  margin-top: 20px;
  font-size: 2.5em;
}

label {
  display: block;
  margin-bottom: 5px;
  font-size: 1.2em;
}

[id^="inlinetext_"] {
  background-color: lightgrey;
}

select,
input[type="number"],
input[type="text"] {
  background-color: white;
  border: 2px solid #ddd;
  padding: 10px;
  font-size: 1.2em;
  border-radius: 5px;
  width: 100%;
  max-width: 500px;
  box-sizing: border-box;
  margin-bottom: 10px;
}

select:focus,
input[type="number"]:focus,
input[type="text"]:focus {
  outline: none;
  border-color: #4d90fe;
}

input[readonly] {
  border: 2px solid #ddd;
  padding: 10px;
  font-size: 1.2em;
  border-radius: 5px;
  width: 100%;
  max-width: 500px;
  box-sizing: border-box;
  margin-bottom: 10px;
  background-color: #f1f1f1;
}

button[type="button"] {
  background-color: #4d90fe;
  color: white;
  border: none;
  border-radius: 5px;
  padding: 10px;
  font-size: 1.2em;
  cursor: pointer;
  margin-top: 10px;
}

#selector {
  max-width: 500px;
  margin: 20px auto;
  padding: 20px;
  border: 1px solid #ddd;
  border-radius: 5px;
}

#calculator {
  max-width: 500px;
  margin: 20px auto;
  padding: 20px;
  border: 1px solid #ddd;
  border-radius: 5px;
}

#calculator h2 {
  font-size: 1.8em;
  margin-top: 0;
  margin-bottom: 20px;
  text-align: center;
}

#guide {
  max-width: 500px;
  margin: 20px auto;
  padding: 20px;
  border: 1px solid #ddd;
  border-radius: 5px;
}

#guide h2 {
  font-size: 1.8em;
  margin-top: 0;
  margin-bottom: 20px;
  text-align: center;
}

#guide p {
  font-size: 1.3em;
  margin-top: 20px;
  margin-bottom: 5px;
  text-align: left;
}