.course-development-box {
    display: block;
}

.course-development-box {
    padding-top: 100px;
    height: 780px;
    background: url(/storage/companyAdvantage/s9.jpg) no-repeat center center;
    background-size: cover;
    overflow: hidden;
}

.course-development-box img {
    vertical-align: middle;
    max-width: 100%;
    height: auto;
}

.course-development-box * {
    box-sizing: border-box;
}

.course-development-box>h3 {
    margin-bottom: 25px;
    color: #000000;
    text-align: center;
    letter-spacing: 4px;
    font-size: 2.1875rem;
    font-family: sans-serif;
}

.even-box {
    position: relative;
    padding-top: 90px;
    height: 440px;
    width: 100%;
    margin-top: 100px;
}

.event-list {
    margin-bottom: 50px;
    height: 200px;
}

.even-box .page {
    position: relative;
    left: 50%;
    margin-left: -228px;
    width: 340px;
    height: 55px;
    text-align: center;
    font-size: 1.125rem;
    line-height: 55px;
}

.even-box .page .prev {
    background-color: #c5c5c5;
    color: rgba(255, 255, 255, 0.7);
    font-family: number;
}

.even-box .page .next {
    background-color: #337FE5;
    color: rgba(255, 255, 255, 0.7);
    font-family: number;
}

.even-box .page div {
    float: left;
    width: 50%;
    letter-spacing: 5px;
    font-family: sans-serif;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.even-box .show-box {
    position: absolute;
    right: 50%;
    bottom: 40px;
    overflow: hidden;
    margin-right: 230px;
    width: 420px;
    height: 430px;
    background-color: #fff;
    -webkit-box-shadow: 0PX 20px 70px #c5c5c5;
    box-shadow: 0PX 20px 70px #c5c5c5;
}

.show-box ul {
    height: 360px;
    -webkit-transition: all 0.5s;
    transition: all 0.5s;
    list-style: none;
    padding: 0;
    margin: 0;
}

.show-box li {
    float: left;
    padding: 10px;
    width: 420px;
    height: 100%;
}

.show-box li .pic {
    position: relative;
    overflow: hidden;
    margin-bottom: 24px;
}

.show-box li .p1 {
    text-align: center;
    color: #555;
    font-size: 14px;
    line-height: 1.5;
}

.event-list ul {
    position: relative;
    padding: 0;
    margin: 0;
    margin-left: 50%;
    height: 1px;
    background-color: #999;
    -webkit-box-shadow: 0 0 1px #000;
    box-shadow: 0 0 1px #000;
    -webkit-transition: all 0.5s;
    transition: all 0.5s;
    list-style: none;
}

.event-list ul li {
    position: absolute;
    width: 140px;
    height: 100px;
    color: #4c4c4c;
    text-align: center;
    font-size: 3.75rem;
}

.event-list ul li.on .dian i {
    background-color: #337FE5;
}

.event-list ul li .dian {
    position: absolute;
    left: 50%;
    z-index: 3;
    display: block;
    margin-left: -10px;
    width: 20px;
    height: 20px;
    border-radius: 100%;
    background-color: #fff;
    -webkit-box-shadow: 0 0 8px #bbb;
    box-shadow: 0 0 8px #bbb;
}

.event-list ul li.on::before {
    opacity: 1;
}

.event-list ul li::before {
    position: absolute;
    left: 50%;
    z-index: 2;
    display: block;
    width: 400px;
    height: 1px;
    background-color: #337FE5;
    -webkit-box-shadow: 0 0 1px #337FE5;
    box-shadow: 0 0 1px #337FE5;
    content: '';
    opacity: 0;
}

.event-list ul li.on .year {
    color: #337FE5;
    text-shadow: 0 6px 16px rgb(132 186 81 / 40%);
}

.event-list ul li .year {
    position: absolute;
    right: 0;
    left: 0;
    display: block;
    width: 100%;
    letter-spacing: 3px;
    font-family: number;
    cursor: pointer;
}

.event-list ul li .dian i {
    display: block;
    margin: 5px;
    width: 10px;
    height: 10px;
    border-radius: 100%;
    background-color: #4d4d4d;
}

.event-list ul li:last-child::before {
    right: 50%;
    left: auto;
}

.event-list ul li:nth-child(even) {
    top: -100px;
}

.event-list ul li:nth-child(odd) {
    bottom: -100px;
}

.event-list ul li:nth-child(odd)::before {
    top: 0;
}

.event-list ul li:nth-child(even)::before {
    bottom: -1px;
}

.event-list ul li:nth-child(odd) .year {
    bottom: 0;
}

.event-list ul li:nth-child(even) .year {
    top: 0;
}

.event-list ul li:nth-child(even) .dian {
    bottom: -10px;
}

.event-list ul li:nth-child(odd) .dian {
    top: -10px;
}

.event-list ul li:nth-child(odd) .text_overflow {
    top: -70px;
}

.event-list ul li:nth-child(even) .text_overflow {
    bottom: -70px;
}

.event-list ul li .text_overflow {
    position: absolute;
    left: 50%;
    margin-left: -100px;
    width: 200px;
    text-align: center;
    letter-spacing: 2px;
    font-size: 1rem;
    cursor: pointer;
    height: 44px;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    text-overflow: ellipsis;
    -webkit-line-clamp: 2;
    overflow: hidden;
    color: #4c4c4c;
    font-size: 16px;
}