.course_list {
    display: flex;
    flex-wrap: wrap;
    gap: 0px;
    justify-content:flex-start;
}

.course_item {
    width: 33%;
}

.course_img {
    min-height: 200px;
    background: #d9d9d9;
    transition: all 0.6s;
}

.course_item:hover .course_img{
    background: #ccc;
}
.course_item a {
    display: block;
    color: initial;
    margin: 10px;
    text-decoration: none;
}

.course_item a b {
    display: block;
    font-size: 22px;
}