<!DOCTYPE html>
<html>
<head>
<title>Solar System: Document Object Model:30 Days Of JavaScript</title>
<link href="https://fonts.googleapis.com/css?family=Montserrat:300,400,500,600,700&display=swap" rel="stylesheet">
</head>
<body>
<header>
<h1>Calculate a weight of an object on a planet</h1>
<input type="text" id="mass" placeholder="Mass in Kilogram" />
<select>
<option value='none'>--select planet-- </option>
</select>
<button>Calculate weight</button>
</header>
<main>
<div class="flex-container">
<div class="flex-item image">
<img src='./images/earth.png' class="planet-image" />
</div>
<div class="flex-item description"></div>
</div>
</main>
<script src="./scripts/main.js"></script>
</body>
</html>