.change-red-box {
    position: relative;
    border: 1px solid #D60F0F;
    border-radius: 3px;
    background-color: #FBE6E6;
    padding: 1rem;
}

.change-red-box::after {
    position: absolute;
    content: "";
    background-image: url(/ekiren_self/assets/img/common/arrow.svg);
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    width: 4rem;
    height: 1.5rem;
    bottom: -3.8rem;
    left: 50%;
    transform: translateX(-50%);
}

@media screen and (min-width:780px) {
    .change-red-box::after {
        bottom: -4.8rem;
    }
}