Untitled

body {
    margin:0px;
    padding:0px;
    background:url('nasaback.jpg');
    background-size:cover;
    background-position:center;
}

h1 {
    color:white;
    font-size:80px;
    text-align:center;
    margin:50px 0px 25px 0px;
    background-color:black;
    height:100px;
}

input[type="text"], select {
    width:500px;
    padding: 8px 0px;
    margin:12px 500px;
    height:50px;
    font-size:20px;
    border:none;
    border-radius:15px;
    text-align:center;
    color:black;
}

input[type="submit"] {
    width:250px;
    padding: 8px 0px;
    margin:20px 500px 0px 630px;
    height:50px;
    font-size:20px;
    border:none;
    border-radius:15px;
    text-align:center;
    color:white;
    cursor:pointer;
    background-color:blue;
}

input[type="submit"]:hover {
    width:500px;
    transition:0.5s;
    padding: 8px 0px;
    height:50px;
    font-size:20px;
    border:none;
    border-radius:15px;
    text-align:center;
    color:white;
    cursor:pointer;
    background-color:green;
    position:relative;
}

<!DOCTYPE html>
<html>
<head>
    <title>Nasa Login Form</title>
    <link href="nasa.css" type="text/css" rel="stylesheet">
</head>
<body>
    <h1>Welcome To NASA Usa</h1>
    <form class="login-form">
        <Input type="text" placeholder="Your Name">
        <br>
        <input type="text" placeholder="Street">
        <br>
        <input type="text" placeholder="Block">
        <br>
        <input type="text" placeholder="State">
        <br>
            <select id="country" name="country">
                <option value="North America">North America</option>
                <option value="South America">South America</option>
                <option value="Asia">Asia</option>
                <option value="Middle East">Middle East</option>
                <option value="Antartica">Antartica</option>
            </select>
        <br>
        <input type="text" placeholder="Landmark">
        <br>
        <input type="text" placeholder="Mobile No">
        <br>
        <input type="submit" value="Enroll Me In" name="">
    </form>
    </body>
    </html>