stage.css

#stageGrid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    padding: 50px 100px;
}

.linkStage {
    margin: auto;
    width: 25%;
    height: 45vh;
    position: relative;
    background-color: white;
    cursor: pointer;
    border-radius: 10px;
    user-select: none;
}

.linkStage:hover .stageHover {
    display: flex;
}

.linkStage .stageHover {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    height: 100%;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.25);
    border-radius: 10px;
    display: none;
}

.linkStage img {
    width: 100%;
    height: 100%;
    border-radius: 10px;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}