button{
    outline: none;
    cursor: pointer;
    display: block;
    position: relative;
    text-align: center;
    padding: 1em 2em;
    border: 2px solid #4f918d;
    color: #4f918d;
    background-color: transparent;
    font-family: sans-serif;
    font-size: 16px;
    font-weight: 400;
    text-transform: uppercase;
    line-height: 1;
    letter-spacing: .25em;
    transition: all .4s ease;
}

button:hover,
button:focus{
    box-shadow: inset 0px 0px 0px 30px #4f918d;
    color: #FFF;
}