body {
        background-color: #8FBC8F;
        ;
}

.button {
        border-radius: 4px;
        background-color: #2F4F4F;
        border: none;
        color: white;
        text-align: center;
        font-size: 18px;
        padding: 10px;
        width: 170px;
        cursor: pointer;
        margin: 5px;
        text-decoration: none;
        font-family: Arial, Helvetica, sans-serif;
}

.centered {
        position: fixed;
        /* or absolute */
        top: 50%;
        left: 50%;
        /*margin-top: -50px;
            margin-left: -100px;*/
        transform: translate(-50%, -50%);
}