.gs-theme-changer {
    position: fixed;
    background-color: #fff;
    width: 400px;
    padding: 16px;
    z-index: 1;
    right: 20px;
    bottom: 20px;
    margin: auto;
    border-radius: 8px;
    box-shadow: 0px 0px 20px 10px rgba(0,0,0,0.05);
}

.gs-theme-btn {
    background-color: #f1f1f1;
    font-family: "Source Sans Pro", sans-serif, Arial;
}
.gs-theme-btn:hover {
    background-color: #ddd;
}