.caption {
    position: relative;
    overflow: hidden;
}
.caption__media {
    display: block;
    min-width: 100%;
    max-width: 100%;
    height: auto;
}
.caption__overlay {
    position: absolute;
    top: 80;
    right: 0;
    bottom: 0;
    left: 0;
    padding: 10px;
    color: white;
    transform: translateY(100%);
    transition: transform .35s ease-out;
}
.caption:hover .caption__overlay {
    transform: translateY(0);
}

.caption__overlay__title {
    margin: 0;
    padding: 0 0 12px;
    transform: translateY( calc(-100% - 10px) ); /* +10px overlay padding */
    transition: transform .35s ease-out;
}
.caption:hover .caption__overlay__title {
    transform: translateY(0);
}

.caption::before {
    content: ' ';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: transparent;
    transition: background .35s ease-out;
}
.caption:hover::before {
    background: rgba(0, 0, 0, .5);
}

.caption {
    ...
    transform: translateZ(0);
}