.container
 {
	padding: 0px;
	display: flex;
	flex-wrap: wrap;
 }
 
 .element
{
    margin: auto;
}

 button, button::after
 {
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
 }

button
{
    background: none;
    border: 4px solid #838181;
    border-radius: 10px;
    color: #838181;
    display: block;
    font-size: 1em;
    font-weight: bold;
    margin: 10px auto;
    padding: 0.5em 2em;
    position: relative;
    text-transform: uppercase;
}

button::before, button::after
{
    background: #838181;
    content: '';
    position: absolute;
    z-index: -1;
}

button:hover
{
    color: #000;
}

.button::after
{
    height: 0;
    left: 0;
    top: 0;
    width: 100%;
}

.button:hover:after
{
    height: 100%;
}

.button1::after
{
    height: 0;
    left: 0;
    bottom: 0;
    width: 100%;
}

.button1:hover:after
{
    height: 100%;
}