a:hover img {
    opacity: 0.8;
    transition: 0.6s ease opacity;
}

.tg {
    border-collapse: collapse;
    border-spacing: 0;
}

.tg td {
    font-family: Arial, sans-serif;
    font-size: 14px;
    padding: 10px 5px;
    border-style: solid;
    border-width: 1px;
    overflow: hidden;
    word-break: normal;
    border-color: black;
}

.tg th {
    font-family: Arial, sans-serif;
    font-size: 14px;
    font-weight: normal;
    padding: 10px 5px;
    border-style: solid;
    border-width: 1px;
    overflow: hidden;
    word-break: normal;
    border-color: black;
}

.tg .tg-0lax {
    text-align: left;
    vertical-align: top
}

/* link_items */
.link_items {
    margin: 3rem 0 !important;
}

.link_item {
    float: left;
    width: calc(25% - 16px);
    padding: 8px;
}

@media screen and (max-width: 768px) {
    .link_item {
        float: left;
        width: 100%;
        padding: 8px 0;
    }
}

.link_item:hover {
    opacity: 0.8;
}

.link_item_image {
    text-align: center;
}

.link_item_image img {
    max-width: 100%;
}

.link_item_title {
    color: #3f3f3f;
    font-size: 18px;
    line-height: 2.4;
}

.link_item_desc {
    text-align: left;
    color: #3f3f3f;
    font-weight: normal;
    line-height: 2.250em;
    letter-spacing: 0;
}


/* Course */
.thumitem a {
    position: relative;
    width: 158px;
    height: 158px;
}

@media screen and (max-width: 768px) {
    .thumitem a {
        position: relative;
        width: 140px;
        height: 140px;
    }
}

.thumitem a img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: 50% 0;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    margin: auto;
}