#portfolio .box {
    background: #f3f3f3;
}

.portfolio-items,
.portfolio-filter {
    list-style: none;
    padding: 0;
    margin: 0;
}

.portfolio-items {
    margin-right: -20px;
}

.portfolio-filter {
    margin-bottom: 50px;
    text-align: center;
}

    .portfolio-filter > li {
        display: inline-block;
    }

.portfolio-items > li {
    float: left;
    padding: 0;
    margin: 0;
}

.portfolio-items.col-2 > li {
    width: 50%;
}

.portfolio-items.col-3 > li {
    width: 33%;
}

.portfolio-items.col-4 > li {
    width: 25%;
}

.portfolio-items.col-5 > li {
    width: 20%;
}

.portfolio-items.col-6 > li {
    width: 16%;
}

.portfolio-item .item-inner {
    margin: 0 20px 20px 0;
    text-align: center;
    background: #fff;
    padding: 10px;
    border-bottom: 1px solid #e1e1e1;
}

.portfolio-item img {
    width: 100%;
    height: 100px;
    object-fit: cover;
}

/* 3 columns by default */
.grid-sizer {
    width: 50%;
}

@media screen and (min-width: 768px) {
    /* 5 columns for larger screens */
    .grid-sizer {
        width: 25%;
    }
}

.portfolio-item .portfolio-image {
    position: relative;
}

.portfolio-item h5 {
    margin: 0;
    padding: 10px 0 0 0;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
}

.portfolio-item .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    background-color: rgba(255, 255, 255, 0.9);
    text-align: center;
    vertical-align: middle;
    -webkit-transition: opacity 300ms;
    -moz-transition: opacity 300ms;
    -o-transition: opacity 300ms;
    transition: opacity 300ms;
}

    .portfolio-item .overlay .preview {
        position: relative;
        top: 50%;
        display: inline-block;
        margin-top: -20px;
    }

.portfolio-item:hover .overlay {
    opacity: 1;
}