<form>
  <label for="name">Full Name:</label>
  <input id="name" name="name" type="text" />

  <label for="email">Email Address:</label>
  <input id="email" name="email" type="email" placeholder="name@example.com" />

  <label for="age">Your age:</label>
  <input id="age" name="age" type="number" value="18" placeholder="You must be 18+" />
</form>

label {
  display: block;
  margin-top: 1em;
}

input:placeholder-shown {
  background-color: ivory;
  border: 2px solid darkorange;
  border-radius: 5px;
}