html, body {
        width: 100%;
        height: 100%;
        margin: 0px;
        border: 0;
        overflow: hidden; /*  Disable scrollbars */
        display: block;  /* No floating content on sides */
}

button {
        padding: 5px;
        background: rgb(0, 0, 0);
        border: 1px solid rgb(255, 255, 255);
        border-radius: 2px;
        outline: none;
        width:120px;
        height:100px;
        font-size:15px;
        color: white;
}

button.active, button:active {
        background: rgb(255, 255, 255);
        border: 1px solid rgb(0,0,0);
        box-shadow: 0 0 2px 0 rgb(0,0,0);
        color: black;
}