button {
    display: block;
    -webkit-transition: all .2s;
    -moz-transition: all .2s;
    -o-transition: all .2s;
    -ms-transition: all .2s;
    height: 30px;
    width: 100%;
    border-style: none;
    border-width: 0px;
    background-color: rgb(40,40,40);
    color: whitesmoke;
    border-radius: 4px;
    font-family: Consolas;
}

button:hover
{
    background-color:rgb(30,30,30);
}