.portfolio-section {
    margin-bottom: 40px;
    margin-left: 10px; 
    margin-right: 10px;
}

.section-title {
    color: white;
    text-align: center;
    margin-bottom: 20px;
    font-size: 2em;
}

.grid {
    margin: 0 auto;
}

.grid-sizer,
.grid-item {
    width: calc(100% / 3 - (20px / 3));
    margin-bottom: 10px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: box-shadow 0.3s;
}

.grid-item img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 10px;
}

.caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 10px;
    opacity: 0;
    transition: opacity 0.3s;
    border-radius: 0 0 10px 10px;
}

.grid-item:hover .caption {
    opacity: 1;
}

.grid-item {
    position: relative;
}

@media (max-width: 768px) {

    .grid-sizer,
    .grid-item {
        width: calc(50% - (10px / 2));
    }
}

@media (max-width: 480px) {

    .grid-sizer,
    .grid-item {
        width: 100%;
    }
}