config.scss

.config {
    position: fixed;
    right: 0;
    z-index: 1000;

    .ms-Button--default {
        padding: 0;
        margin: 0 0 15px 0;
        border-radius: 18px 0 0 18px;
        border: 1px solid #ccc;
        color: #0573bc;
    }

    .ms-Button--default:hover {
        background-color: orangered;
        color: #fff;
    }
}

.ms-Fabric {
    .ms-Panel-commands {
        margin: 0;
    }
}