.gallery-box>.gallery-content-box>div {
    display: inline-block;
    border: 1px solid gray;
}

.gallery-content-box {
    white-space: nowrap;
    overflow: hidden;
}

.gallery-item {
    margin: 0.5%;
    width: 18.5%;
}
.gallery-item-current{
    border: 1px solid black
}

@media screen and (max-width:500px) {
    .gallery-item {
        margin: 0.5%;
        width: 48%;
    }
}

.gallery-item img {
    width: 100%;
}

.gallery-box {
    position: relative;
    padding: 1rem 3rem;
}

.gallery-btn-prev {
    transform: translate(0, -50%);
    position: absolute;
    top: 50%;
    left: 0;
    text-align: center;
    height: 4rem;
    padding: 1rem 0;
    width: 2rem;
    border-radius: 0.4em;
    background-color: black;
    color: white;
    cursor: pointer;
}

.gallery-btn-next {
    transform: translate(0, -50%);
    position: absolute;
    top: 50%;
    right: 0;
    text-align: center;
    height: 4rem;
    padding: 1rem 0;
    width: 2rem;
    border-radius: 0.4em;
    background-color: black;
    color: white;
    cursor: pointer;
}

.gallery-btn-next img {
    width: 2rem;
}

.gallery-btn-prev img {
    width: 2rem;
}