.gallery-item{
    position: relative;
    padding-bottom: 75%;
}
.gallery-image{
    position: absolute;
    top: 0;
    width: 100%;
    height: 100%;
}
.gallery-image img{
    width: 100%;
    height: 100%;
    min-height:100%;
    max-height:100%;
}

.bottom-bar{
    position: absolute;
    padding-top: 5px;
    padding-bottom: 5px;
    width: 100%;
    bottom: 0;
    left: 0;
    background-color: var(--color-black-80);
    transition: 0.6s;
}
.gallery-item:hover .bottom-bar{
    bottom: -40%;
}
.gallery-item .over{
    position: absolute;
    top: -100%;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    left: 0;
    background-color: var(--color-black-80);
    transition: .6s;
}
.gallery-item:hover .over{
    top: 0;
}