CSS transation yardım!

a.tus{
	position:fixed;
	right:-140px;
	bottom:20px;
	z-index:1;
	height:27px;
	width:auto;
	background:#1C2833;
	text-decoration:none;
	color:#21618C;
	text-shadow:4px -1px 3px #000;
	border-bottom:3px solid #34495E;
	opacity:0.8;
}

a.tus span{
	font-weight:bold;
	font-family:Raleway;
	font-size:15px;
	display:block;
	padding-top:6px;
	padding-bottom:6px;
	padding-left:7px;
	padding-right:7px;
    
}
a.tus:hover{
	right:0px;
	bottom:20px;
	opacity:1;
	transition:.4s linear;	
}
a.tus:active{
	background:#34495E;
	color:black;
	text-shadow:none;
	transition:.0s;
}

<a href="mailto:mustq1011@gmail.com" class="tus"><span><b>Bize geri dönüş yapın!</b></span>