Untitled

<!DOCTYPE html>
<html>
<style>
input[type="checkbox"]{
  width: 30px; /*Desired width*/
  height: 30px; /*Desired height*/
  cursor: pointer;
}

</style>
<body>

<form action="">
<input type="checkbox" name="vehicle" value="Bike"  style="vertical-align:middle">I have a bike<br>
<input type="checkbox" name="vehicle" value="Car" style="vertical-align:middle">I have a car
</form>

</body>
</html>