.headerbutton {
	
	display: block;
    height: auto;
    max-width: 100%;
    
}

.headerbutton:hover {
	
	display: block;
    height: auto;
    max-width: 100%;

 	border-radius: 120%;
 	
 	-moz-transition-duration:1s;
	-moz-transition-timing-function:linear;
	
	-o-transition-duration:1s;
	-o-transition-timing-function:linear;
	
	-ms-transition-duration:1s;
	-ms-transition-timing-function:linear;
	
	
	-webkit-transition-duration:1s;
	-webkit-transition-timing-function:linear;
	transition-duration:1s;
	transition-timing-function:linear;	
 	
 	-webkit-transform:rotate(90deg); 
  	-moz-transform:rotate(90deg);
  	-o-transform:rotate(90deg); 
  	-ms-transform:rotate(90deg); 
  	transform:rotate(90deg);
}