#notify-size-btn {
    background: red;
    color: #fff;
    padding: 10px;
    border: none;
    cursor: pointer;
}

#sns-popup {
    display: none;
    position: fixed;
    background: #fff;
    padding: 20px;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 10px #000;
}