header {
background-color: green;
position: relative;
top: 0;
left: 0;
width: 100%;
margin-bottom: 10px;
}

div.header-button{
#background-color: red;
display: inline-block;
float: right;

}
div.body{
position: relative;

}

footer {
background-color: red;
position:fixed;
left: 0;
bottom:0;
width:100%;
text-align: right;

}