.mLB-thumbnail {
    float: left;
    width: 25%;
}

/* Hide the slides by default */
.mLB-mySlides {
    display: none;
}

/* Next & previous buttons */
.mLB-prev,
.mLB-next {
    cursor: pointer;
    position: absolute;
    top: 50%; 
    width: 50px; height: 50px;
    margin-top: -25px;
    color: white;
    font-size: 0px;
    user-select: none;
    -webkit-user-select: none;
    background-color: #000;
}
.mLB-prev {left: -25px;}
/* Position the "next button" to the right */
.mLB-next {right: -25px;}

    /* On hover, add a black background color with a little bit see-through */
    .mLB-prev:hover,
    .mLB-next:hover { }

/* Caption text */
.mLB-caption {
    text-align: center;
    background-color: black;
    padding: 2px 16px;
    color: white;
}

.mLB-thumbnail {
    opacity: 0.5; cursor: pointer;
}

.active,
.mLB-thumbnail:hover {
    opacity: 1;
    border-color: #000
}