Button can't be moved without affecting heading text

I have this login page made from HTML5 and CSS3 and I'm having trouble adjusting the Login Button. Every time I try to align it with the margin: attribute, it affects the "Welcome" text as well. How can I move the button only without affecting the text?
<!DOCUYPE html>
<head>
<style>
html {
  background-image:url('http://image.downloadwap.co.uk/wallpapers/wp/18/nature/maligne-st_pJi7nPeU.jpg');
  background-repeat:no-repeat;
  min-height:100%;
  background-size:cover;
 }

h1{
color:#ffffff;
font-size:40px;
margin-top:20px;


}

#Login{
   padding-left:20px;
   padding-right:20px;
   padding-top:10px;
   padding-bottom:10px;
   text-align: center;
   background-color:#0095f0;
   display: inline-block;
   border: none;
   color:#ffffff;
   font-weight:bold;
   border-radius:4px;
   size:15px;


}
</style>
</head>
<body>
<form action="oof">
<button id="Login" >
Login
</button>
</form>
<h1 align="center">Hello<br /> Welcome!</h1>
<img src="http://image.downloadwap.co.uk/wallpapers/wp/18/nature/maligne-st_pJi7nPeU.jpg"
width="100%" height="100%" size=">
</body>
</DOCUYPE>

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