.rakun-introduction {
    border: var(--base-yellow) 1px solid;
    border-radius: 10px;
    width: 95%;
}

@media only screen and (min-width: 350px) {
    .rakun-introduction {
        width: 80%;
    }
}

@media only screen and (min-width: 500px) {
    .rakun-introduction {
        width: 400px;
    }
}

@media only screen and (min-width: 700px) {
    .rakun-introduction {
        width: 500px;
    }
}

.character-box {
    width: 250px;
    height: 100px;
    position: relative;
}

@media only screen and (min-width: 768px) {
    .character-box {
        height: 135px;
    }
}

.character-rakun {
    margin: 0 auto;
    opacity: 0;
    width: 150px;
    object-fit: cover;
    position: absolute;
    left: 50%;
    top: 0;
    transform: translateX(-50%);
    animation: raKunChange 16s 0s infinite;
}

@media only screen and (min-width: 768px) {
    .character-rakun {
        width: 200px;
    }
}

.character-rakun:nth-of-type(2) {
    animation-delay: 8s;
}

@keyframes raKunChange {
    0% {
        opacity: 0;
    }
    8% {
        opacity: 1;
    }
    45% {
        opacity: 1;
    }
    50% {
        opacity: 0;
        z-index: 9;
    }
    100% {
        opacity: 0;
    }
}

.sticker01-box {
    width: 200px;
    height: 170px;
    position: relative;
}

.sticker01-rakun {
    margin: 0 auto;
    opacity: 0;
    width: 200px;
    object-fit: cover;
    position: absolute;
    left: 50%;
    top: 0;
    transform: translateX(-50%);
    animation: Sticker01RakunChange 16s 0s infinite;
}

@media only screen and (min-width: 1220px) {
    .sticker01-box {
        width: 300px;
        height: 250px;
        position: relative;
    }

    .sticker01-rakun {
        width: 300px;
    }
}

.sticker01-rakun:nth-of-type(2) {
    animation-delay: 4s;
}

.sticker01-rakun:nth-of-type(3) {
    animation-delay: 8s;
}

.sticker01-rakun:nth-of-type(4) {
    animation-delay: 12s;
}

@keyframes Sticker01RakunChange {
    0% {
        opacity: 0;
    }
    4% {
        opacity: 1;
    }
    21% {
        opacity: 1;
    }
    25% {
        opacity: 0;
        z-index: 9;
    }
    100% {
        opacity: 0;
    }
}

.sticker01-box::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0);
    transition: background-color 0.3s ease;
    z-index: 10;
    border-radius: 10px;
}

.sticker01-box:hover::after {
    background-color: rgba(128, 128, 128, 0.5);
}