100 Buttons 039

button{
    outline: none;
    cursor: pointer;
    display: block;
    position: relative;
    text-align: center;
    border: none;
    background-color: transparent;
    color: #000;
    padding: 1em 2em;
    font-family: monospace;
    font-size: 18px;
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: .2em;
    transition: all .3s ease;
}

button:before,
button:after{
    content: "";
    position: absolute;
    z-index: -1;
    transition: all .3s ease;
}

button:before{
    top: -1px;
    left: -1px;
    width: 100%;
    height: 100%;
    border-top: 1px solid #000;
    border-left: 1px solid #000;
    max-width: 15%;
    max-height: 35%;
}

button:after{
    bottom: 0;
    right: 0;
    width: 100%;
    height: 100%;
    border-bottom: 1px solid #000;
    border-right: 1px solid #000;
    max-width: 15%;
    max-height: 35%;
}

button:hover:before,
button:focus:before,
button:hover:after,
button:focus:after{
    max-width: 100%;
    max-height: 100%;
}