css animated button
/*
Try this code by yourself
HTML Layout
<button>
login
<span></span>
</button>
*/
/* Custom Design our button*/
button{
padding: 10px;
background-color: #f00;
width: 120px;
position: relative;
border-radius: 10px;
overflow: hidden;
}
button > span{
position: absolute;
top: 0;
left: 0;
height: 100%;
width: 0;
background-color: #00f;
transition: .3s ease-in-out;
}
button:hover > span{
width: 100%;
}