.floating-calendar-banner{
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 250px;
    z-index: 9999;
    transition: opacity .25s ease, transform .25s ease;
}

.floating-calendar-banner:hover{
    opacity: 0.65;          /* 少し透ける */
    transform: translateY(-2px); /* 少し浮く */
}

.floating-calendar-banner__image{
    display: block;
    width: 100%;
    height: auto;
}