<form>
  
  <p>
  <label for="phone_num">Your Home Phone No:</label>
  <input type="tel" id="phone_num" name="phone_num" required/>
  </p>
  <input type="submit" value="Send"/>
</form>  
form {
  width: 50%;
  margin: auto auto;
}

input[type="submit"] 
{
  font-weight: bold;
  padding: 5px 20px;
  border:1px solid #888;
  cursor: pointer;
  background: #2b90d9;
  color: white;
  font-size:1.1em;
}

input[type="tel"] {

  height: 24px;
  font-size:1.2em;
}

input[type="tel"]:focus {
  border: 1px solid blue;
}

External CSS

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External JavaScript

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