html, body {
    background-color: #e7f4ff !important;
    background-image: none !important;
}
/* Bluesky アイコン強制上書き（フォントアイコンを消して画像を載せる） */
.sp_f_nav li:nth-child(4) a:before {
    content: "" !important;
    display: block !important;
    width: 28px !important;
    height: 28px !important;
    margin: 0 auto !important;
    background-image: url("https://quesera-spa.com/upload/pub/Bluesky_Logo.jpg.svg") !important;
    background-size: contain !important;
    background-repeat: no-repeat !important;
    background-position: center !important;
    opacity: 1 !important;
}