.course-container{
    position: relative;
}
.course-overlay{
    background-color: rgba(255, 255, 255, 0.63);
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    position: absolute;
    justify-content: center;
    align-items: center;
    display: none;
}
.course-container:hover > .course-overlay{
    display: flex !important;
}